单项选择题
A.in entrance
B.in exit
C.in the upper part
D.on the outside
单项选择题 The most suitable pump for oily water separator feed duties is （）.
单项选择题 Placing a filter on the （） of an oily water separator will "polish" the discharge but overloading must be avoided.
单项选择题 The resistance to the movement of the globule in oily water mixture depends on its size and the （） of the fluid.