题目内容：
主要用于革兰阴性菌感染，而对革兰阳性菌作用差的药物是
参考答案：
答案解析：
单选题：主要用于革兰阴性菌感染，而对革兰阳性菌作用差的药物是
- 题目分类：药学专业知识(一)
- 题目类型：单选题
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