单项选择题
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
A spur gear pump should be operated with the discharge ...
单项选择题A spur gear pump should be operated with the discharge valves （）.
A.slightly opened B.throttled C.fully opened D.halfway opened
The capacity of a centrifugal pump can be increased by ...
单项选择题The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to （）.
A.increase speed B.increase the size of the cardent assembly C.reduce wearing ring clearances D.change the pump to a "close coupled" arrangement
