單項(xiàng)選擇題The process of removing moisture from air is known as（）.

A.humidification
B.dehumidification
C.vaporization
D.evaporation


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1.單項(xiàng)選擇題The heat gained per pound of refrigerant in the evaporator is known as the（）.

A.latent heat of vaporization
B.sensible heat
C.refrigerating effect
D.specific heat of vaporization

3.單項(xiàng)選擇題On all vessels equipped with refrigeration units of over 20 cubic foot capacity, （）.

A.a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided
B.it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus
C.spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus
D.all of the above

4.單項(xiàng)選擇題The emergency bilge suction valve is typically used （）.

A.to inject cleaning additives when the bilges are extremely dirty
B.when the main condenser becomes fouled, in order to provide additional cooling water circulation
C.to connect the rose box to the independent bilge suction
D.if the bilges become flooded and they can not be emptied by any other means

5.單項(xiàng)選擇題Short cycling of a refrigeration compressor refers to （）.

A.frequently grounding out
B.frequently starting and stopping
C.running too fast
D.running too slow