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

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

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

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

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

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

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）

If separating effect is not good, which measure should be taken （）

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

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