单选题Which of the following is wrong about operation of oily water separator?（）Afilled with clean water before operationBkeep air cushion in oil collecting space during runningCcheck oil level during runningDclean inner separator with low pressure stream
单选题
Which of the following is wrong about operation of oily water separator?（）
A
filled with clean water before operation
B
keep air cushion in oil collecting space during running
C
check oil level during running
D
clean inner separator with low pressure stream
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