金属材料的韧性单位常用（）来表示。
A.kg/m
B.kg/mm
C.kg/mm2
D.kg/m2
参考答案：D
国库收支统计报表是由哪几类数据构成？
— You know that you were driving at 100 kilometres an hour, _____?
— No, officer, I couldn't have been. This car can't do more than 80. [ ]
A. don't you
B. weren't you
C. did you
D. are you
