单项选择题

Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.

A.hydraulic fluid contamination
B.excessive fluid friction
C.turbulent fluid flow
D.fluid pressure surges

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单项选择题

A.yearly
B.quarterly
C.monthly
D.daily

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