A.your work becoming rounded
B.injury to your hand
C.overheating of the file
D.pinning
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A.for atomizing
B.for centrifuging
C.in a storage tank
D.in the re-circulating line
A.BRC
B.MCC
C.AUT-0
D.AUT-1
A.Navigation Log Book
B.Engine Room Log Book
C.Oil Record Book
D.Muster List
A.STCW78
B.STCW95
C.SOLAS74
D.SOLAS88
A.the suction stroke
B.the compression stroke
C.the expansion stroke
D.the exhaust stroke
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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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
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Using a file without a handle may result in （）
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