题目内容
相对分子质量小的物质或离子都可以通过自由扩散进入细胞。
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Now listen to the conversation and fill out each blank with proper words or phrases to answer the question: Why did Maggie think she would be the best student union president?Because she truly __(1)_____ the students at the university and she would________(2)______ in her power to improve______(3)____ at this great university.
一个脉振磁通势可以分为两个波长与脉振波完全一样，分别朝相反方向旋转的旋转波。
甲类传染病是指
我国法定传染病中的乙类传染病包括
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