單項選擇題The cylinders, with cooling jackets, are （） to the engine frame by eight tie rods.
A.screwed
B.welded
C.fastened
D.rotated
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1.單項選擇題The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.
A.steel
B.copper
C.cast iron
D.stainless steel
2.單項選擇題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
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