单项选择题
The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.
A.screwing into B.being screw on C.to screw on D.screwed into
单项选择题 The cylinder covers and the liners are bolted together by means of （）.
单项选择题 The cylinder cover is not provided with （）.
单项选择题 The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.
