问题补充:
某人直臂提一桶水时,这时手臂上肱二头肌和肱三头肌的状态分别是
A. 肱二头肌收缩,肱三头肌收缩
B. 肱二头肌收缩,肱三头肌舒张
C. 肱二头肌舒张,肱三头肌收缩
D. 肱二头肌舒张,肱三头肌舒张
答案:
(答案→)A. 肱二头肌收缩,肱三头肌收缩
B. 肱二头肌收缩,肱三头肌舒张
C. 肱二头肌舒张,肱三头肌收缩
D. 肱二头肌舒张,肱三头肌舒张
解析:略
某人直臂提一桶水时 这时手臂上肱二头肌和肱三头肌的状态分别是A. 肱二头肌收缩 肱三头肌收缩B. 肱二头肌收缩 肱三头肌舒张C. 肱二头肌舒张 肱三头肌收缩D. 肱二头肌舒张 肱三