将pH=8的Ba(OH)2溶液加水稀释1000倍,稀释后所得溶液中Ba2+浓度与OH--浓度之比为:
It’s high time you had your hair cut ; it’s getting _______ .
My friend showed me round the town, ______ was very kind of him.
They use computers to keep the traffic _______ smoothly.
If you leave the club, you will not be_____back in .
What I need is_____ book that contains ______ABC of oil painting.