在反应3Cl2+8 NH3 = N2+6NH4Cl中,氧化剂与还原剂的物质的量之比为( )
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.