皮皮学，免费搜题
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【多选题】
有关单纯扩散的叙述,正确的有
A.
顺浓度差转运
B.
依靠膜载体转运
C.
不耗能
D.
通过膜通道转运
E.
借助膜上泵的作用
拍照语音搜题，微信中搜索"皮皮学"使用
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