单项选择题
The bearing cap and shell are replaced and tightened up until （）.
A.the “ nip ”is zero B.the “ nap ” is zero C.the “ gap ”is correct D.the “ clearance ” is correct
单项选择题 In （）the control action is independent on the output.
单项选择题 The （）is fitted on an oily water separator.
单项选择题 The （）is not a component of an oil separator.
