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单选题
They understand the （） of automatic sludge discharging of the purifierBut they are not good in practice.
A
principle
B
principal
C
cause
D
case
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单选题To ensure oil purifier working in normal condition,the interval between two sludge discharging should not exceed（） hours.A
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单选题船舶需要装卸货。（）A
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