A.opposite polarity
B.the same polarity
C.negative polarity
D.positive polarity
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A.larger and heavier than
B.as much as
C.smaller and lighter than
D.more dangerous than
A.one slip-ring
B.two sliprings
C.three sliprings
D.four sliprings
A.stationary；rotate
B.stationary；stationary
C.rotate；stationary
D.rotate；rotate
A.sine
B.cosine
C.tangent
D.cotangent
A.one
B.less than one
C.more than one
D.negative one
最新試題
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
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
Cold weather starting of a diesel engine may be made easier by（）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
The shipboard oil pollution emergency plan will be invalid after （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The main purpose of port State control is not to（）
Which of the following items don’t belong to dock repair works?（）
To proceed to the assistance of a ship in distress is（）
If separating effect is not good, which measure should be taken （）