单项选择题

氨苯喋啶的利尿作用机制是( )。 A.
抑制K+-Na+-2Cl-共同转运系统 B.
抑制Na+-Cl-转运系统 C.
拮抗醛固酮 D.
抑制碳酸酐酶 E.
抑制远曲小管及集合管对NaCl的重吸收

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多项选择题

Which of the following statements about protein denaturation are correct
A、Destruction of disulfide bonds and non-covalent bonds can occur.
B、The peptide bonds are broken and the biological activity is lost.
C、The primary structure and biological activity remain unchanged.
D、The spatial structure is destroyed and the biological activity is lost.

单项选择题

在Excel中按某一字段内容进行归类，并对每一类做出统计的操作是__________。
A、排序
B、记录单处理
C、筛选
D、分类汇总