题目: 下列哪项不属于大环内酯类药物的特点A.抗菌谱窄,但比青霉素广B.细菌对本类药物各药间不产生交叉耐药性C.作用于细菌核糖体50S亚基,阻止蛋白质合成D.不易透过血脑屏障E.主要经胆汁代谢,并进行肝肠循环 答案: 参考答案:B
题型:选择题 Lucy said that she had never heard _________ music before. [ ]A. such a beautiful piece of B. so a piece of beautifulC. so beautiful a D. such a beautiful 查看答案