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【多选题】
属于等张收缩特点的是A.
外加负荷恒定，肌肉收缩长度缩短
B.
外加负荷变化，肌肉收缩速度不同
C.
外加负荷恒定，肌肉收缩速度相同
D.
外加负荷恒定，肌肉收缩张力与阻力相等
E.
外加负荷恒定，肌肉收缩张力与阻力不同
F.
外加负荷恒定，肌肉收缩张力大于阻力
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