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

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 main purpose of port State control is not to（）

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

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

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

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

The treatment of the fuel oils involves storage, heating, filtering and（）

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

The ISPS Code consists of a mandatory section-Part A, which shows（）