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问题
单项选择题
繁殖期杀菌剂是
A．氨基糖苷类
B．大环内脂类
C．头孢菌素类
D．磺胺药
E．多黏菌素类
答案
参考答案：C
选择题
The two students _____ late yesterday.
A. are all
B. were all
C. are both
D. were both
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名词解释
五运六气
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