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It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.

A、the suction stroke

B、the compression stroke

C、the expansion stroke

D、the exhaust stroke

时间：2022-01-04 10:08 关键词： 船舶电气与船舶安全

答案解析

C