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单选题
Cylinder是哪种基本物体（）。
A
立方体
B
圆柱体
C
球体
D
茶壶
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the top of the column；the cylinder blocksD
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单选题（）during the last repair?A
Did you have No.4 cylinder repairB
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Didn’t you have No.4 cylinder repaired
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单选题The main factor determining the output of each cylinder is the cylinder （）.A
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单选题The cylinder covers and the liners are bolted together by means of （）.A
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causeC
resultD
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copperC
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