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问题 单项选择题

检查肾上腺素，盐酸去氧肾上腺素中杂质酮体原理是利用酮体在多少波长处有最大吸收，而主成分在此波长处却几乎没有吸收（）。

A.310nm

B.130nm

C.268nm

D.425nm

E.256nm

答案

参考答案：A

选择题

–Jim passed the Chinese exam. What about Jack? --             .

A．He did so

B．So did he

C．So he did

D．So did she
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选择题

Parents must allow their children to receive      education by law.

A．compulsory

B．traditional

C．primary

D．cultura1
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