I don't know when ____ famous. [ ]
A. does he become
B. he becomes
C. did he become
答案:B
残损空箱一般是指不能使用的集装箱,也即等待修理或正修理的空箱。( )
作用于核蛋白体50S亚基,阻碍肽链延长的抗菌药物()。
A.红霉素
B.庆大霉素
C.四环素
D.青霉素
E.头孢菌素