单项选择题
The type of gauge most commonly used to measure pressure is the （）.
A.bimetallic type
B.diaphragm type
C.bourdon tube type
D.resistance-temperature type
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When refrigerant leaves the receiver, it flows next on to the （）.
A.evaporator coils
B.liquid strainer
C.compressor
D.condenser -
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A compound gauge is typically installed on the （）.
A.suction side of a bilge pump
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单项选择题
Which of the listed statements is correct concerning the starting of centrifugal pumps?（）
A.They should always be started with the discharge valve closed
B.They should always be started with the discharge valve opened
C.A priming pump is always required to flood the impeller suction
D.They should always be started with the sealing line valves closed
