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【单选题】
在讨论无分电器双缸点火系统时；甲说当一对火花塞跳火时，气缸中的一个处于排气行程，另一个处于膨胀行程；每对火花塞串联跳火。试问谁正确？（）A.
甲正确
B.
乙正确
C.
两人均正确
D.
两人均不正确
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