根据图a和图b回答问题.1图a是屈肘动作图b是伸肘 动作21和{2}分别表示两种肌肉1是肱二头肌2是肱三头肌3在图a Template




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tomski根据图a和图b回答问题.1图a是屈肘动作图b是伸肘 动作21和{2}分别表示两种肌肉1是肱二头肌2是肱三头肌3在图a coloring