什么叫连续铸钢?
参考答案:
连续铸钢是将钢水连续不断地浇注到水冷结晶器内,并开始凝固结晶,然后由拉坯机把铸坯从结晶器中拉出,再喷水冷却,完全凝固成钢坯的工艺。
We shouldn’t complain about________, because many families are much _____ in the mountainous area.
A.being poor; worse off
B.being rich; better off
C.to be poor; badly off
D.to be rich; well off
Bt.乳剂是一种良好的杀细菌药剂。