The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.

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• On the approach of a warm front the barometric pressure usually（）.

  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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• Neglecting friction，you desire to lift a 300 kgs weight with a stress on the hauling part of 100 kgs.Which of the following tackles would you use（）.

  A . Gun tackle B . Luff tackle C . Two-fold tackle D . Double-luff tackle

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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?（）

  A . Differential B . Trunk C . Barrel D . Valve-in-head

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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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• If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

  A . a low load on the unit B . a clogged pump suction strainer C . a blockage in the line between the pump and hydraulic motor D . the hydraulic motor turning too fast

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• The duty of a deck winch is to lift and lower a load by means of a fixed rope on （）.

  A . a warp end B . a mooring winch C . a worm gear D . a barrel

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• The hatch at the after end of the canopy in a lifeboat（）the after lifting hook, painter, and tow line.

  A . give access to B . links up with C . have contact with D . is constructed of

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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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• 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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• Stress on the topping lift of a swinging boom can be reduced by（）.

  A . rigging a back stay B . raising the boom C . increasing the mechanical advantage of the cargo purchase D . taking all slack out of the preventer

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• The part of the anchor windlass that engages the anchor chain for lifting is called the （）.

  A、Cranes B、Winches C、Capstans D、Windlass

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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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• Which statement is TRUE concerning the tandem working arrangement of pedestal cranes when completing a quad lift? （）

  A . The discharge is slow due to the size of the cargo and all the cranes working together B . The cargo discharge can be accomplished with controlled pendulation C . The cargo discharge can be performed in port or at anchor D . The cranes enable the handling of heavy cargos without shoreside assistance

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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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• The static suction lift of a pump is the difference in elevation between the （）.

  A . centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump B . centerline of the pump and the suction liquid level when the source of liquid is above the pump C . centerline of the pump and the level of the discharge liquid D . liquid levels of the suction and discharge

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• Morning clouds lifting out of the Longwood valley______obscure the highest mountain in the region.

  A．part B．partial C．partially D．partiality

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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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• He also was unable to lift himself up off of the furniture in our house.（翻译)

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