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单项选择题
A.evaporator pressure decrease
B.evaporator coil over-feed
C.evaporator capacity increase
D.expansion valve diaphragm rupture
单项选择题
A.head capacity to improve
B.discharge to be reversed
C.efficiency to decrease
D.slippage to decrease
单项选择题
A.gums, acids, and varnishes
B.removed by cellulose type filters
C.neutralized by oil additives
D.not removed by absorbent filters
单项选择题
A.repack all valve stems
B.lubricate it prior to use
C.replace the foundation bolts
D.balance the warping heads
单项选择题
A.blue
B.green
C.orange
D.purple
单项选择题
A.blue
B.green
C.orange
D.purple
单项选择题
A.excessive condenser cooling water
B.warm food in the refrigerator
C.a shortage of refrigerant
D.s shortage of compressor oil
单项选择题
A.either all the way open or all the way closed
B.normally open
C.throttled depending on load
D.controlled by suction pressure
单项选择题
A.(1) only
B.(2) only
C.(1) and (2)
D.(1), (2) and (3)
单项选择题
A.Control of evaporation
B.A separate means to prevent feed-water contamination
C.Power circulating pump
D.Super-heater
