Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）

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• Lubricating oil systems are fitted with a wide variety of strainers some of which can be cleaned in site while others have replaceable cartridgesThe bold and italic word “which” means （）.

  A . lubricating oil B . lubricating oil systems C . strainers D . cartridge

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• The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.

  A . sufficient quantity； measured B . measured quantity；sufficient C . excessive quantity；sufficient D . the less quantity the better；the more the better

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• Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they （）.

  A . are exposed to a vacuum B . come in contact with extremely hot surfaces C . are reduced in temperature to just above the pour point D . become extremely agitated or aerated

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• he system administrator is making system wide changes to a server， which will add to the PATH variable for the server environment.  Where is the PATH variable found for the system？（）

  A . /profile B . /etc/envpath C . /etc/profile D . /etc/environment

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• Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）

  A . Flash point improvers B . Pour point improvers C . Inhibitors D . Foam suppressor

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• The system administrator is making system wide changes to a server， which will add to the PATH variable for the server environment.  Where is the PATH variable found for the system？（）  

  A . /profile B . /etc/envpath C . /etc/profile D . /etc/environment

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• Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.

  A . cylinder liners and piston rings B . main bearings C . crankpin bearings D . turboblower

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• The system administrator is making system wide changes to a server, which will add to the PATH variable for the server environment. Where is the PATH variable found for the system?（）

  A . /profile B . /etc/envpath C . /etc/profile D . /etc/environment

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• （）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.

  A . Large crosshead type；crossheads B . High speed；the cylinders C . Large crosshead type；the cylinders D . Four-stroke；pistons and cylinder

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• （）provides strength and strong space for fule,lubricating oil,fresh water,salt(ballast)water and potable water.

  A . The double bottom B . The cofferdam C . The navigating bridge D . The superstructure

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• An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）

  A . have a high viscosity index B . mix readily with refrigerant C . have a high freezing point D . have a low pour point

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• There will usually be summaries or daily account tables for heavy oil, diesel oil, lubricating oil, and fresh water, which will be compiled（）

  A . at the beginning of every watch B . at the beginning of the first watch every day C . at the completion of every watch D . at noon every day

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• A system administrator needs to configure dump devices for the system. Which command would be used to estimate the size required for a dump device？（）

  A . lsdev B . chdev C . sysdumpdev D . sysdumpstart

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• The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.

  A . low viscosity index B . high viscosity index C . high neutralization number D . low demulsibility quality

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• In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）

  A . lubricating oil B . dry sump C . circulated tank D . wet sum

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• The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.

  A . 8-10℃ B . 10-12℃ C . 10-15℃ D . 10-20℃

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• Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）

  A . Splash B . Gravity C . Pressure D . Bypa

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• There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.

  A . recirculating B . total loss C . cooling D . refrigeratio

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• （） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.

  A . Too larger B . Too smaller C . Excess D . Excessive

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• The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.

  A . to be kept B . logged C . changed D . has remained

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• The guiding coordinate system for setting the axes is the left hand coordinate system.

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• Flowcharting is used primarily for program design and rarely for systems design.（)

  是 否

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• Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.

  A.carbon deposits on the compressor suction valves B.the evaporator temperature to increase C.rapid corrosion of the thermal expansion valve D.no operating problems

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• 若打印图形 * 实现代码如下。 *** ***** ******* for （int i=1 ; i＜= a ; i++) { for （int j="1;" j++) system.out.print（“*”); system.out.print（“\n”); } a处为（＞ A、3

  B、4 C、5 D、6

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