单项选择题
When separating fuel oil in oil separator, the separating quantity is（） of the real quantity.
A.100% B.80% C.1/2 D.1/3
单项选择题 When separating lube oil separator, the optimal separating quantity is（）of the rated quantity on name plate.
单项选择题 One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
单项选择题 When two oil separators are working in series, they should work with （）
