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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
2
B
4
C
5
D
6
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考题
单选题In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.A
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单选题Before the sludge in a purifier is ejected,（）A
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All of the above
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