单项选择题
A.yearly B.quarterly C.monthly D.daily
A thermostatic expansion valve is properly controlling ...
单项选择题A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.
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
