水样采集后,pH应在()内测定。不能马上测定的样品,如果加入1滴()溶液(25g/L),盖好瓶盖,允许保存()。
参考答案:6 h;氯化汞;2 d
It's clear that neither he nor his parents______ the plan put forward at the family meeting.
A.agrees to
B.are for
C.is in favor of
D.agree on
夏天从冰箱中取出鸡蛋,常看到鸡蛋先变湿后变干,此过程中发生的物态变化是先_______后________.