外表面带有药皮涂料的厚壁无缝管作熔化电极的电渣焊称为（）。
A.丝极电渣焊
B.板极电渣焊
C.熔嘴电渣焊
D.管极电渣焊
参考答案：D
I walked in our garden, ________Tom and Jim were tying a big sign onto one of the trees.
A．which
B．when
C．where
D．that
斜拉桥施工中偏差的处理和索力调整方法是什么
