试题与答案

四冲程汽油机在进气行程活塞到达下止点时,曲轴转过半周,进气门(),进气行程结束。

题型:填空题

题目:

四冲程汽油机在进气行程活塞到达下止点时,曲轴转过半周,进气门(),进气行程结束。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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