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

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

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

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

Diesel engine air start system check valves are opened by （）

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

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

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

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

Flame failure in an automatically fired auxiliary boiler can from a/an （）