焊接接地扁铁，其搭接长度应为扁铁宽度的（）。
A.1倍
B.2倍并三面焊接
C.3倍
D.5倍
参考答案：B
I don't think he will come here on time, ? [ ]
A. won't he
B. will he
C. does he
D. is he
汽车从甲地到乙地用了3．4小时，从乙地返回甲地用了3小时，返回时的速度比去时快百分之几’( )
A．20%
B．13.3%
C．120%
D．125%
