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单选题
To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bowl removed by admitting （）.
A
flashing water
B
operating oil
C
flushing water
D
sealing water
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单选题A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）A
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A pistonB
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gravity discB
centrifugal bowlC
a stack of discsD
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engines camshaftC
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increased fuel consumptionB
increased feed water consumptionC
fuel pump failureD
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单选题Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by- products which are normally （）.A
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（1）B
（1）and（2）C
（2）D
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单选题（）is not a process of weathering of the oil spilled in the sea water.A
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DispersionC
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grease cupsC
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