單項(xiàng)選擇題The latent heat of water vapor in air is dependent upon the ()

A.dry bulb temperature
B.wet bulb temperature
C.dew point
D.dry point


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1.單項(xiàng)選擇題If you find an extremely large refrigerant leak while using a halide torch, your flame will()

A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue

2.單項(xiàng)選擇題Before charging a refrigeration unit, the refrigerant charging lines should be()

A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor

3.單項(xiàng)選擇題In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and from ().

A.petroleum crystals
B.phosgene gas
C.water vapor
D.carbon monoxide

4.單項(xiàng)選擇題In an operating refrigeration system low on refrigerant, a liquid line sight glass will()

A.be clear
B.be blue
C.be light green
D.show bubbles

5.單項(xiàng)選擇題The thermal expansion valve reacts directly to the ()

A.temperature in the space being cooled
B.liquid refrigerant pressure at the solenoid valve
C.pressure drop across the evaporator coils
D.refrigerant gas superheat at the coil outlet

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The shipboard oil pollution emergency plan will be invalid after ()

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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()

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The treatment of the fuel oils involves storage, heating, filtering and()

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The main purpose of port State control is not to()

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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()

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The condensers located in various stages of a flash evaporator are cooled by()

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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()

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The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated()

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Diesel engine air start system check valves are opened by ()

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