The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）

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• The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to（）.

  A . a difference in water pressure B . the method of breaking up the water stream C . the length of the applicator D . All of the above

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• The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.

  A . temperature B . density C . deflection D . speed

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• The 12-foot low-velocity fog applicator（）.

  A . has a spray pattern 12 feet in diameter B . can be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzles C . has a 90°bend at its discharge end D . has a screw thread end which connects to the all-purpose nozzle

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• A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.

  A . a flame trap B . a relief valve C . a fusible plug D . a bursting ca

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• The rising velocity of the globules carries them upwards where they become trapped by the under surfaces of plates and （）until the enlarged globules have sufficient rising velocity to travel along the plate surface and break away at periphery.

  A . A.disperse B . B.coalesce C . C.compress D . D.shrinkage

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• The effective temperature of air is dependent upon（） Ⅰ.relative humidity Ⅱ.air velocity

  A . Ⅰonly B . Ⅱonly C . Both Ⅰand Ⅱ D . NeitherⅠnor Ⅱ

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• The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）

  A . system is overcharged with refrigerant B . system is low on refrigerant C . discharge valves are leaking excessively D . discharge valves are leaking slightly

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• Compared to a low pressure system，generally the air in a high is（）.

  A . warmer，less dense，and less stable B . cool，more dense，and drier C . muggy and cloudy D . extremely moist with high relative humidity

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• Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）

  A . Impeller B . Electric motor C . Volute D . Eye

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• The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

  A . has begun B . takes place C . occurs D . happe

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• The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.

  A、superheated B、super-cooled C、at or below the dew point D、All of the above

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• To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.

  A . discharge service valve as a vapor B . suction service valve as a liquid C . charging valve as a liquid D . condenser purge valve as a vapor

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• High-velocity fog（）.

  A . is a finer，more diffuse water spray than low-velocity fog B . requires that the water pressure be no greater than 60 psi C . produces an effective fog pattern no more than 6 feet beyond the nozzle D . extinguishes a fire by absorbing heat and reducing the supply of oxyge

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• The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.

  A . air bottle B . air compressor C . crank case D . combustion chamber

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• Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?（）

  A . Constant pressure B . Pulse C . constant velocity D . Axial flow

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• The ball hit the ground and ________ (蹦跳)high into the air.

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• If not attached to the nozzle, each low-velocity spray applicator on a vessel must be stowed__________.

  A.in a protected area on the main deck B.inside a machinery space near the entrance C.next to the fire hydrant to which the fire hose is attached D.on a rack inside the quarters near the entrance

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• Refer to the exhibit. For the given configuration, on packets leaving the router on interface FastEthernet0/0 that matches the high traffic class, what will the MPLS experimental bit be set to？（）

  <img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/54c4736819a81433c4cc933dbe7c4cb7.jpg' /> A. 0 B. 1 C. 2 D. 3 E. 4 F. 5

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• INTERNATIONAL TRANSPORTATION Transportation plays an important part in international business because goods produced have to be delivered to the buyers abroad, and the delivery of goods is to be made possible by transportayion services. Goods are carried by several means of transportation - on road or rail, by sea or air.And in recent years,combined transportation which is a road-sea-rail carriage has appeared. With the expansion of international trade, the container service has become popular. The use of containers provides a highly effective form. of transportation by road, rail and sea. Basically, about 98% of world trade is carried out by sea transportation.Besides transportation by sea, road, or rail, nowadays in order to speed up delivery, carriage by air has also become popular.

  1. Transportation plays an important part in international business because goods produced have to be sent to everywhere in the world.() 2. Usually goods are carried by many ways of transportation.() 3. In recent years, combined transportation which is a road-sea-rail carriage appeared.() 4. With the expansion of international trade, the container service has become popular.() 5. The use of containers gives a very helpful method of transportation by air.()

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• Mothers can be seen leaving supermarkets with trolleys piled high with "junk food". Their families are eating far more calories than______good for them.

  A．is B．are C．that is D．those are

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• The banana "tree" is actually not a real tree. This is because there is no wood in the stem(树干) rising above the ground. The stem is made up of leaves growing very close together, one inside the other. The leaves spread out at the top of the stem and rise in the air.

  Banana plants need a lot of care and attention. They must be provided with water if the normal rainfall doesn't supply enough. The area around the plants must be kept free of weeds and grass. About nine or ten months after planting, a flower appears on the banana plant. This flower is at the end of a long stalk(茎), which grows from the base up through the center of the stem and turns downward when it comes out from the top. Small bananas form. on this flower stalk as it grows down- ward. Bananas really grow upside down. As the small bananas form. on the stalk, they point down- ward, but as they grow they mm and point upward. Bananas are harvested while they are still green. Even when they are to be eaten where they are grown, they are not allowed to ripen on the plant. A banana that turns yellow on the plant loses its taste. The first paragraph in the text mainly discusses ______. A．why the banana tree is not a tree B．how the banana grows on the stem C．why the stem of the tree is wood D．how the leaves grow out of the stem

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• 15、在这种情况下，物体的速度随时间呈线性变化。 In this case, the velocity of an object ____________ the time.

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• 29、4 航空运输只适宜长途旅客运输和体积小、价值高的物资，鲜活产品及邮件等货物运输。 Air transport is only suitable for long-distance passenger transport and the transportation of goods such as small size and high value materials, fresh products and mail.

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• The physical distribution of products has two primary aspects: transportation and storage.Both aspects are highly developed and specialized phases of marketing.The costs of both trans-porting and storing are built into the prices of products.Transportation can be by truck, rail-way, ship, or barge.For some items, such as exotic plants and flowers, or when rapid delivery is essential, air freight may be used.

  Storage, or warehousing, is a necessary function because production and consumption of goods rarely match: items generally are not sold as quickly as they are made.Inventories build up,both in warehouses and at retail establishments, before the foods are sold.The transporta-tion function is involved in bringing goods to a warehouse and taking them from it to retail stores. Storage performs the service of stabilizing market price.If, for example, no agricultural product could be stored, all food would have to be put on the market immediately.This would, of course, create a glut and lower prices drastically.There would be an immediate benefit to consumers, but in the long run they would suffer.Farmers, because of low prices, would be forced off the land, and the amount of food produced would decrease.This, in turn, would raise consumer prices. Warehouses for storage are of several types.Private warehouses are owned by manufactur-ers.Public warehouses, in spite of their name, are privately owned facilities, but they are in-dependent of manufacturer ownership.General-merchandise warehouses store a great variety of products.Cold-storage warehouses store perishable goods, especially food products.Grain ele-vators are a kind of warehouse used to keep wheat and other grains from spoiling.A bonded warehouse is one that stores foods, frequently imported, on which taxes must be paid before theyare sold.Cigarettes and alcoholic beverages are common examples. The distribution center is a more recently developed kind of warehouse.Many large com- panics have several manufacturing plants, sometimes located outside the country.Each plant doesnot make every company product but specializes in one or more of them.The distribution center allows a manufacturer to bring together all product lines in one place.Its purpose is to minimize storage and to ease the flow of goods from manufacturers to retailers rather than build up extensive inventories.It reduces costs by speeding up product turnover.Very large corporations will have several distribution centers regionally or internationally based 1.The main subject of this passage is______. A、transportation and storage B、storage of products C、distribution center D、two main aspects of product distribution 2.Warehousing is important in that ______. A、inventories build up before the goods are sold B、the prices will go down C、more goods are produced than can be consumed D、the food has to be put on the market immediately 3.How many types of warehouses for storage are discussed in the passage？() A、3 B、4 C、6 D、7 4.Where might one find meat and milk？() A、Grain elevator B、Cold-storage warehouse C、Private warehouse D、Bonded warehouse 5.What is NOT true of a distribution center？() A、It is a relatively new type of warehouse B、Product is replaced more quickly and costs are down C、Some distribution centers are not built in the sane country as the factory D、It builds up extensive inventories to minimize storage

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