注射剂一般控制pH范围为
A. .4~11
B. 4~9
C. 2~9
D. 3~8
E. 5~8
已知盐酸普鲁卡因的氯化钠等渗当量为0.18,若配制0.5%盐酸普鲁卡因等渗溶液200ml,需加入多少克氯化钠
A. 0.72g
B. .0.18g
C. 0.81g
D. 62g
E. 33g
There are 1 billion people in the world who study English every year.[音频]
A. 对
B. 错
The European Union uses only English in its meetings.[音频]
A. 对
B. 错