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

Cold weather starting of a diesel engine may be made easier by（）

Using a file without a handle may result in （）

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

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

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

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

The cetane rating of diesel fuel is an indication of the （）

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

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