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

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

The treatment of the fuel oils involves storage, heating, filtering and（）

For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

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

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

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

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

Using a file without a handle may result in （）