单项选择题
The operating water is supplied under the （）of an oil separator.
A.sliding bowl bottom B.bowl hood C.bowl D.filter units
单项选择题 The （）has a water damp ring.
单项选择题 Duty officer informs us that the vessel is out of harbor and in “Full Ahead”We are going to run （）.
单项选择题 The bearing cap and shell are replaced and tightened up until （）.
