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單項(xiàng)選擇題

The main factor which determines the output of each cylinder is （）

A.the cylinder weight
B.the cylinder bore
C.the cylinder length
D.the cylinder cover

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單項(xiàng)選擇題

The main factor determining the output of each cylinder is the cylinder （）.

A.density
B.bore
C.weight
D.material

單項(xiàng)選擇題

The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.

A.steel guides
B.steel shells
C.steel bearing caps
D.pig iron