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

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

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

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

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

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

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

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

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

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）