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【单选题】
细菌对青霉素产生耐药性的主要机制是
A.
细菌细胞膜对药物通透性改变
B.
细菌产生了水解酶
C.
细菌产生了大量PABA（对氨苯甲酸）
D.
细菌产生了钝化酶
E.
细菌的代谢途径改变
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【简答题】A good way to pass an exam is to work hard every day in the year, You may fail in an exam if you are lazy for most of the year and then work hard only a few days before the exam. If you are taking an ...
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