单项选择题
A.frequently grounding out B.frequently starting and stopping C.running too fast D.running too slow
When a flash-type evaporator is to be secured for an ex...
单项选择题When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.
A.completely filled with saltwater B.filled with de-scaling compound C.tightly closed to exclude air D.vented to the atmosphere
Condensate must be drained periodically from the air co...
单项选择题Condensate must be drained periodically from the air compressor receivers to prevent （）.
A.second stage cylinder lockup B.oil sump contamination C.faulty operation of pneumatic valves D.corrosion of air receiver baffles
Overheating of a hydraulic system may be a result of （）...
单项选择题Overheating of a hydraulic system may be a result of （）.
A.changing pump discharge pressure in response to normal load variations B.a high oil level C.incorrect fluid viscosity D.continued slow re-circulation of the oil
