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【单选题】
细胞膜内外保持Na + 和K + 的不均匀分布是由于( )A.
膜在安静K + 的通透性大
B.
膜在兴奋时对Na + 的通透性大
C.
Na + 扩散的结果
D.
膜上Na + 一K + 泵的作用
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【简答题】用支路电流法求解各支路电流,并指出各支路电流的实际方向。
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A.
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B.
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A.
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D.
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A.
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B.
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C.
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【单选题】一电路有4个节点和6条支路，用支路电流法求解各支路电流时，应列出独立的KCL方程KVL放的数目分别为( )。
A.
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B.
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D.
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