铜怀钢焊接时,由于膨胀系数相差很大,故容易发生()
参考答案:焊缝热裂纹
—You're not angry then?
—______. I've never laughed so much in my life.[ ]
A. You're joking
B. You've made it
C. That's all right
D. Far from it
I _________ a basketball.[ ]
A. play
B. have
C. watch
D. not have