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问题描述：

[单选] 47如果我们制作个机器人只让其一个方向进、我要采用的结构是（）
A．连杆结构 B．棘轮棘爪 C．杠杆 D．齿轮传动
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答案解析：无
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上一篇：当阻力作用线到支点作用线的距离大于动力点到支点的距离时，杠杆（） 下一篇：下列运用到凸轮结构的是（）

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