一般来说，机构的操作分为吸货、洗盘、拉升和出货四个阶段
参考答案：错
The factory has developed a lot____ we visited the advanced worker five yeas ago.
A．when
B．which
C．that
D．where
Ⅰ级钢筋采用电弧搭接焊，应采用()电焊条。
A.结422
B.结502
C.结506
D.结606
