A.gas freed
B.inerted
C.filled with water
D.all of the above as necessary
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A.Static electricity
B.An open running electric motor
C.Loose wiring
D.Explosion proof lights
A.Class "A"
B.Class "B"
C.Class "C"
D.Class "D"
A.convection
B.conduction
C.radiation
D.direct contact
A.class "A" fire
B.class "B" fire
C.class "C" fire
D.class "D" fire
A.5%
B.10%
C.25%
D.40%
最新試題
The cetane rating of diesel fuel is an indication of the （）
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
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
If separating effect is not good, which measure should be taken （）
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.
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
Which of the following items don’t belong to dock repair works?（）
The treatment of the fuel oils involves storage, heating, filtering and（）