单选题The separating effect of oil separator is not very good, the reason may be（）Atoo little seal waterBimproper gravity discCoil discharging pump not working very wellDlow water level of the working water
单选题
The separating effect of oil separator is not very good, the reason may be（）
A
too little seal water
B
improper gravity disc
C
oil discharging pump not working very well
D
low water level of the working water
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