碎(卵)石在料堆上取样时,取样部位均匀分布,取样时先将取样部位表层铲除,然后由各部位抽取大致相等的石子()份组成一组试样。
A.4
B.8
C.12
D.16
参考答案:D
I________the wonderful 2010 World Cup Finals live on TV,but this summer vacation I missed it.[ ]
A.could have watched
B.might watch
C.must have watched
D.need have watched
分散相与连续相存在密度差导致
A.乳剂破裂B.乳剂絮凝C.乳剂分层D.乳剂转相E.乳剂酸败