冷轧低碳钢焊接热影响区由过热区、正火区和部分相变区三部分组成。( )
参考答案：错
I don't think Richard could have done such a stupid thing last night, ________? [ ]
A. do I
B. could he
C. did he
D. has he
专业发票是一种特殊的发票，经有关部门批准，由主管部门自定式样，自行印刷、发放和管理，但必须套印发票监制章。( )
