某氮的氧化物和灼热的铁按4NxOy+3yFe=yFe3O4+2xN2的反应式进行反应。在一个特定的实验中,2mol该氧化物与足量红热的铁完全反应,生成1molN2和1molFe3O4。该氧化物的化学式为( )
If you leave the club, you will not be_____back in .
What I need is_____ book that contains ______ABC of oil painting.
Jenny nearly missed the flight______ doing too much shopping.
The CDs are on sale! Buy one and you get ______ completely free.
I’m sure that your letter will get______ attention. They know you’re waiting for the reply.