如果装配间隙大小不均匀，会（）
A、影响埋弧焊过程稳定
B、引起焊接应力不均匀
C、导致意外收缩变形
D、接头强度降低
参考答案：A, B, C
—He should have been warned of the danger.
—_______, but he wouldn’t listen to me .
A．So he had
B．So had he
C．So was he
D．So he was
下列不是西北地区种植业分布区的是
A．天山山麓
B．河西走廊
C．湟水谷地
D．河套平原
