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

The shipboard oil pollution emergency plan will be invalid after （）

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

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

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

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

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

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

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

Using a file without a handle may result in （）