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单选题
The boiling and condensation points of a refrigerant depend on the （） exerted upon it.
A
temperature
B
pressure
C
velocity
D
heat
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oil entrained in the refrigerantC
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单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A
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liquid refrigerant flooding the compressor and systemC
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单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.A
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单选题When the heavy fuel oil is heated to achieve the viscosity of 10-15 cst, may occur.To avoid this, a system is used in most occasions（）A
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