单项选择题
The cylinder head, cylinder liner and （） form the combustion chamber.
A.frame B.piston C.crankcase D.explosion plate
单项选择题 The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.
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 （）.
