下侧门挂环角部接口焊接时，应达到（）
A.点焊固
B.对接圆周满焊
C.双面焊
参考答案：B
I can guess you were in a hurry. You your sweater inside out.
A．had worn
B．wore
C．were wearing
D．are wearing
就网络密度而言，与农村居民相比，城市居民拥有的社会网络通常是（）
A.密网
B.近似密网
C.近似松网
D.松网
