单项选择题
A.changing the angle of the tilting plate B.changing the speed of the pump C.moving the slide block and rotor D.moving the shaft trunnion block
An excessive charge of refrigerant in an air-cooled ref...
单项选择题An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A.oil foaming in the compressor B.higher than normal suction and discharge pressures with a higher box temperature C.higher than normal discharge pressure with a normal box temperature D.the compressor to run continuously
When the steering gear is in operation, you should （）.A...
单项选择题When the steering gear is in operation, you should （）.
A.check hydraulic oil levels every hour B.check the rams for overheating C.check for excessive oil leakage from rams D.drain water from telemotor cylinders each watch
The oil in a cargo winch gear box should be sampled per...
单项选择题The oil in a cargo winch gear box should be sampled periodically to （）.
A.prevent the gear box from leaking B.prevent the oil from becoming inflammable C.make sure it has not become contaminated D.make sure the motor bearings are lubricated
