Using a file without a handle may result in （）

（）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（）

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.

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

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

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

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

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