题目内容
肌丝滑行理论的直接证据是骨骼肌收缩时
2021-11-23
A.明带和H带缩短，暗带长度不变
B.明带缩短，暗带和H带长度不变
C.暗带长度缩短，明带和H带不变
D.明带、暗带和H带长度均缩短
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