不定项选择

机械全可变气门执行机构是在传统凸轮驱动的基础上，通过改变凸轮与气门之间的传动关系实现气门正时和升程的调节。

A．正确
B．错误

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单项选择题

大多数花卉最适宜的土壤pH值为
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B、5—5.8
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