单项选择题
The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by ().
A.passing it through the expansion valve
B.condensing refrigerant in the system condenser
C.passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor
D.maintaining a high pressure on the systems receiver
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In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the().
A.compressor
B.condenser
C.receiver
D.evaporator -
单项选择题
The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to ().
A.secure and tag the electrical circuit
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C.inform all persons in the area not to start the unit
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One of the main differences between the various types of screw pumps is in the ().
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C.pitch of the screws
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