单项选择题
A.evaporator pressure decrease B.evaporator coil over-feed C.evaporator capacity increase D.expansion valve diaphragm rupture
It is possible to mount a double suction centrifugal pu...
单项选择题It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump （）.
A.head capacity to improve B.discharge to be reversed C.efficiency to decrease D.slippage to decrease
Water allowed to accumulate in the hydraulic system oil...
单项选择题Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by- products which are normally （）.
A.gums, acids, and varnishes B.removed by cellulose type filters C.neutralized by oil additives D.not removed by absorbent filters
If an anchor windlass has been idle for some time, you ...
单项选择题If an anchor windlass has been idle for some time, you should （）.
A.repack all valve stems B.lubricate it prior to use C.replace the foundation bolts D.balance the warping heads
