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

（）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.

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

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

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

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

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

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

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