风口小套损坏的原因有哪些?
参考答案:
风口小套损坏的原因主要有铁水的熔损,磨损,及开裂三种。
In the examination, the you are, the mistakes you'll make.
A.careful…little
B.more careless…more
C.careful…few
D.less careful…fewer
为了减小焊接变形,焊接平面交叉焊缝时,应当先焊横向焊缝,后焊纵向焊缝。()