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【单选题】
骨骼肌兴奋-收缩耦联的因子是
A.
Na⁺
B.
K⁺
C.
使Ca²⁺通道开放
D.
Ca²⁺
E.
蛋白质
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举一反三
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did voices come
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voices had come    
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直流正接
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A.
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came voices
C.
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A.
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B.
came noises
C.
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