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单选题
The pressure difference of the gauge on the oily water separator increases greatly, the reason is（）
A
the filter is clogged
B
bilge suction value is clogged
C
suction value and discharge value of the pump do not open fully
D
screw pump is worn seriously and volumetric efficiency is decreased
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keep air cushion in oil collecting space during runningC
check oil level during runningD
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vacuumB
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figure on a gaugeD
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单选题During inspection of oil and oily mixtures from machinery spaces, which of the following factors should be taken into account by the PSCO? （）A
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reduced temperature difference between water inlet and outletD
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