单项选择题
The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.
A.steel B.copper C.cast iron D.stainless steel
单项选择题 The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.
单项选择题 The cylinder head, cylinder liner and （） form the combustion chamber.
单项选择题 The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.
