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.

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

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

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

（） is not installed on the main switchboar.

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（）

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

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

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

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