题目内容

小分子物质在膜蛋白质帮助下,顺浓度差或电位差通过细胞膜的过程是属于

A. 单纯扩散
B. 易化扩散
C. 主动转运
D. 入胞
E. 出胞

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1-18行是一个长句,请判断主句是:——————————————,从句一共——,是————从句。

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