王师傅用4根木条钉成一个四边形木架，如图．要使这个木架不变形，他至少还要再钉上几根木条？（）．_刷题宝

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王师傅用4根木条钉成一个四边形木架，如图．要使这个木架不变形，他至少还要再钉上几根木条？（）．

A：0根

B：1根

C：2根

D：3根

上一题下一题 0.0难度选择题更新时间:2016-11-03 05:03:52

答案(点此获取答案解析）

B

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