The two-stroke cycle begins with the piston coming up from the bottom of its stroke with scavenge ports in the sides of the cylinder being （）.

时间：2019-04-14 06:15:40 关键词：the,with,piston

The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.

A.shut

B.closing

C.opened

D.closed

答案解析

C

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