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单项选择题

插入电子邮件链接的协议为：

A．http
B．ftp
C．file
D．mailto
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多项选择题
维生素C的性质有(   ) A.
二烯醇结构具有还原性,可用碘量法定量 B.
有紫外吸收 C.
二烯醇结构有弱酸性 D.
能发生硫色素反应
单项选择题
I hope I can have the honor to be _________ by the graduate school at your university.
A、declined
B、enrolled
C、attained
D、moderated
多项选择题
For the purpose of inhibiting bacterial resistance, we should ( ) A. strengthen surveillance of bacterial resistance B. update strategy on scientific prescriptions of antibiotics C. update the stringent control on other usage of antibiotics D. accelerate the development of new antibiotic agents
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