One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）