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【单选题】
募集期间是A.
第二个运动单位参与收缩前，第一个运动单位电位连续放电的间隔期
B.
第一个运动单位电位连续放电的间隔期
C.
第二个运动单位电位连续放电的间隔期
D.
募集期间(R1)缩短
E.
募集期间(R1)延长
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B.
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C.
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D.
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A.
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B.
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C.
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A.
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B.
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