单项选择题
In a refrigeration plant the （） need defrosting.
A.fan
B.compressor
C.condenser
D.evaporator
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相关考题
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A.starting air bottles
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The evaporating pressure in R22 vapor compression refrigeration plant should be （） atmospheric.
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C.equal to
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The primary task of the compressed air system is to deliver the starting air necessary for （）
A.starting the ME
B.starting the emergency electric alternator
C.driving the main turbine
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