按夹杂物的化学组成分类,夹杂物可分为哪几类?
参考答案:
按夹杂物的化学组成分类,夹杂物可分为:氧化物夹杂物、硫化物夹杂、其它如氮化物、磷化物等。
It has rained for a whole day.But I think it's going to ___.
A.put up
B.clear up
C.build up
D.call up