题目内容

Which of the following is NOT a fricative in English？

A. [z]
B. [k]
C. [f]
D. [h]

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可以提高吸收能力或组织分布选择性

A. 1位取代基
B. 5位引入氨基
C. 6位引入氟原子
D. 吡啶酮酸的A环
E. 吡啶酮酸的B环喹诺酮类抗菌药物的构效关系中

In Britain,______has the ultimate authority of legislation.

A. the Monarch
B. the Cabinet
C. the House of Lords
D. the House of Commons

维生素B1具有下列哪种结构

A. 异咯嗪环
B. 苯环
C. 环己环
D. 咪唑环
E. 噻唑环

______lie(s)between the boundary of Canada and the U. S. and serve(s)as the boundary between the two countries.

A. The Mississippi River
B. The Great Lakes
C. The Rocky Mountains
D. The Grand Canyon