16.如图为人的屈肘动作示意图请据图回答1图a为伸肘动作.2如果你用�铃锻炼身体做如图b动作时容易感到累这是因为肱二头肌处于 Template




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tomski16.如图为人的屈肘动作示意图请据图回答1图a为伸肘动作.2如果你用�铃锻炼身体做如图b动作时容易感到累这是因为肱二头肌处于 coloring