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【单选题】
动作电位的上升支的形成是由于A.
K + 外流
B.
K + 内流
C.
Cl -外流
D.
Na + 外流
E.
Na + 内流
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A.
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B.
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C.
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D.
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【单选题】abet
A.
to encourage sb to do sth bad
B.
to start to happen or exist
C.
to praise sb publicly
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