焊接时两接触面要求错误的是（）
A.点状
B.面状
C.可离开0.1～0.15mm
D.紧密接触
E.表面粗糙清洁
参考答案：A
--- -Your mobile phone is quite nice. Where did you buy __________ ?
---- In Shenzhen .Do you want to have _______ like this?
A．it , it
B．one , one
C．one , it
D．it , one
Excel中可进行数据的筛选。
