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

When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

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

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

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

The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

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