Every citizen should be responsible _____ his behaviors.[ ]
A. for
B. with
C. on
D. to
答案:A
内河运输的特点有______
A.运量大
B.投资少
C.成本低
D.耗能少
E.速度慢
适用于强酸强碱滴定的指示剂有()
A.溴百里酚酞
B.酚酞
C.甲基橙
D.甲基红
E.铬黑T