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

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

To proceed to the assistance of a ship in distress is（）

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

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

The cetane rating of diesel fuel is an indication of the （）

Using a file without a handle may result in （）

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

（）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.