产品质量控制是企业为生产理想产品、提供顾客满意的服务和减少无效劳动而进行的控制工作。
参考答案：错
药物与基质加热熔融混匀后，滴入不相混溶的冷凝液中得到
A．胶丸
B．滴丸
C．脂质体
D．靶向乳剂
E．微球
—What were you doing _________your mother was cleaning up the room?
—I was reading a book.[ ]
A. until
B. if
C. while
D. though
