The main purpose of port State control is not to（）

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

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

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

（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.

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

Which of the following items don’t belong to dock repair works?（）

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

Cold weather starting of a diesel engine may be made easier by（）

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