---Would you go swimming with us? ---____, but I’m very busy now.

A．No problem

B．I’d like to

C．Of course

D．Sure

I型坡口对接仰焊时，接头间隙小时可用（）。

A.直线形运条法

B.锯齿形运条法

C.月牙形运条法

D.三角形运条法