射剂污染热原的主要途径有()
A.注射用溶剂
B.原、辅料
C.容器与设备
D.生产过程、环境及操作人员
E.输液器具
参考答案:A, B, C, D, E
Before sitting for the entrance examination for post-graduate students, many candidates try to familiarize themselves with the formula of the exam by doing () tests.
A. imitated
B. simulated
C. stimulated
D. exemplary
生活离不开水
(1)生活中,区别硬水和软水用______,冬季常在汽车水箱中加入乙二醇,目的是______;
(2)实验室电解水,电源负极产生的气体是______(填化学式).