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

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

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

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

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

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

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 （）

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

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