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

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.

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

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 main purpose of port State control is not to（）

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

“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

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

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

The condensers located in various stages of a flash evaporator are cooled by（）