The main purpose of port State control is not to（）

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.

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

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

Using a file without a handle may result in （）

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

Flame failure in an automatically fired auxiliary boiler can from a/an （）

Cold weather starting of a diesel engine may be made easier by（）

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

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