單項(xiàng)選擇題The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.
A.steel
B.copper
C.cast iron
D.stainless steel
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1.單項(xiàng)選擇題The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.
A.around
B.among
C.in
D.between
2.單項(xiàng)選擇題The cylinder head, cylinder liner and （） form the combustion chamber.
A.frame
B.piston
C.crankcase
D.explosion plate
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