The pressure difference of the gauge on the oily water separator increases greatly, the reason is（）

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  A . mixed-flow B . axial-flow C . centrifugal D . displacement

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  A . falls B . rises C . is steady D . is unreliable

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• The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.

  A . sudden evaporation of wax crystals in the lubricant B . sudden evaporation of entrapped air in the lubricant C . release of refrigerant from the oil/refrigerant mixture D . release of dissolved lubricant from the refrigerant

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• The pressure head of a pump is given in the unit of （）.

  A . kg B . MPa C . meter fluid column D . None of the above is true

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• In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）

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  A . when B . how C . where D . whether

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• Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）

  A . Pressure-reducing valve B . Unloading valve C . Counterbalance valve D . Pressure-relief valve

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• The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

  A、one valve seats upwards, while the other seats downwards B、the reed valves used on the discharge are made substantially thicker and heavier than thesuction valves C、the suction valve springs exert a greater tension than the discharge valve springs D、the discharge valve springs exert a greater tension than the suction valve springs

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• Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）

  A . The condenser and the expansion valve B . The king valve and the solenoid valve C . The compressor and the expansion valve D . The condenser and the solenoid valve

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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 diurnal variation of pressure is most noticeable（）.

  A . above the polar circles B . in a low pressure area C . during periods of low temperatures D . in the doldrum

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• If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.

  A . increase the flow of the cooling water through the condenser B . adjust the high pressure cutout to maintain the desired pressure C . open the hot gas bypass temporarily to reduce capacity D . purge non-condensable gases to reduce the excess pressure

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• Which of the following terms is used to identify the pressure of the liquid entering a pump?（）

  A . Suction head B . Pump head C . Discharge head D . Total head

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• The vapor pressure of a substance（）.

  A . decreases as temperature increases B . increases with the temperature C . is not affected by temperature D . may increase or decrease as the temperature rise

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• The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.

  A . soluble state B . solid state C . liquefied state D . inert state

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• The （） discharge a nearly constant amount of liquid regardless of pressure.

  A . mixed-flow pump B . axial-flow pump C . centrifugal pump D . displacement pum

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• On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds. This area is called the（）.

  A . prevailing westerlies B . geostrophic winds C . doldrums D . horse latitude

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• The pressure head of a water pump is given in the unit of （）.

  A . kg B . MPa C . mH20 D . None of the above

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• 207. The greater the pressure difference between a high and a low pressure center, the ______ .

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• 194.The local differences between upward pressure of buoyancy and the ship’s local weight give rise to______.

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  The (6)_____ of the EMU is groundless. The countries that will soon formally renounce the right to adjust their nominal exchange rates are not (7)_____ up anything they have not already voluntarily surrendered as part of preparations for monetary union. In the past years not one of the 11 founding members of EMU has (8)_____ in order to enhance its (9)_____. What better proof of the determination and (10)_____ of the European countries to form. an economic and monetary union？ The claims by Euro skeptics that the (11)_____ to EMU membership have sacrificed growth and employment in order to fulfill the convergence criteria don't hold water.(12)_____, government spending of over 50 percent of GDP and taxes and social (13)_____ contributions of over 40 percent were clear (14)_____ that many countries had widely (15)_____ from being market economies. True, the plan for monetary union (16)_____ countries to get their public finances in (17)_____. But such reforms—to put fiscal and social policies on a healthy, economic footing would have been indispensable anyway. Only with a common currency will the EU's single market develop its full dynamic potential. The euro will make pricing more transparent, (18)_____ in greater competition and, (19)_____, stronger growth. The days will be over (20)_____, for want of competition, Europe's economies became rigid and inflexible. A．on no account B．no longer C．without exception D．in vain

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• The equation shows that the slope of a plot of chemical potential against pressure is equal to the molar volume of the substance. An increase in pressure raises the chemical potential of any pure subs

  A．To raise the melting temperature slightly． B．To lower the melting temperature slightly． C．Negligibl E．No effect at all． D．None the above

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• 气体的粘度随压力增高而增高。在低压时，气体粘度随温度升高而增加，随着压力的增加，温度升高对粘度增大的影响越来越小，当压力很高时（100×105Pa以上），气体粘度随温度升高而降低，明显表现出类似于液体的性质。Table 1-13 shows the dynamic viscosity of methane at different pressures and temperatures. It can be seen from the table that the viscosity of gas increases with the increase of pressure. At low pressure, the gas viscosity increases with the increase of temperature. With the increase of pressure, the influence of temperature increase on the inc

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