中国药典采用微生物检定法测定含量的药物有
A.红霉素
B.青霉素V钾
C.青霉素钠
D.盐酸美他环素
E.硫酸庆大霉素
参考答案:A,E
865是一个( )位数,最高位是( )位,它是由( )个百、( )个十和( )个一组成的。
--- Tom, why are you late again?
---- Sorry, manager. My car _________ on my way to the office.
A.broke up
B.broke down
C.broke out
D.broke off