题目内容

四环素类抗生素的作用靶位是（）

A. 细菌核蛋白体30S亚基
B. 细菌核蛋白体50S亚基
C. 细菌胞浆膜上特殊蛋白PBPs
D. 二氢叶酸合成酶
E. DNA螺旋酶

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抗菌素越贵越好（）

A. 对
B. 错

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A. is
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