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【单选题】
每年端午节，我国很多地方举行划龙舟比赛纪念伟大诗人屈原。请问运动员尽力屈肘划桨时，上臂主要肌肉处于什么状态A.
肱二头肌收缩，肱三头肌舒张
B.
肱二头肌舒张，肱三头肌收缩
C.
肱二头肌收缩，肱三头肌收缩
D.
肱二头肌舒张，肱三头肌舒张
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皮皮学刷刷变学霸
举一反三
【简答题】表示层有哪些功能?提供哪些服务?
【单选题】Different peoples _______ at different festivals in different ways because of their cultural or religious _____. [ ]
A.
dress up; beliefs
B.
put on; believes C . wear; belief D. dress up; believes
【简答题】Ways to Deal with the Problem of Energy There are different ways in which people try to deal with the problem of energy.One way is the greater production of common energy sources,such as coal,oil and ...
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