屈肘时，①和②的状态分别是_刷题宝

题干

屈肘时，①和②的状态分别是（　　）

A：①收缩、②舒张

B：都收缩

C：①舒张、②收缩

D：都舒张

上一题下一题 0.0难度选择题更新时间:2015-05-15 02:57:10

答案(点此获取答案解析）

A

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