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

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 （）

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

（） is not installed on the main switchboar.

The condensers located in various stages of a flash evaporator are cooled by（）

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

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

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

Under MARPOL Code the ship to which it applies has to carry （）