Using a file without a handle may result in （）

If separating effect is not good, which measure should be taken （）

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

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

（） is not installed on the main switchboar.

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

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

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

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

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