考虑到药物的副作用,儿童耐药伤寒杆菌可选用()
A.氟喹诺酮类
B.氨苄青霉素
C.去甲万古霉素
D.氯霉素
E.第三代头孢菌素
参考答案:E
There are many disadvantages in grouping pupils just according to their intellectual ability. In fact, bright children are rarely_____by mixed ability teaching.
A.held out
B.held back
C.held up
D.held in
生活污水如需经化粪池处理,粪便污水易于生活废水()。
A、合流
B、分流