( )没有端点,可以向两端( )。
直线;无限延伸
--I didn't know this was a one-way street, officer.
A.That's all right.
B.I don't believe you.
C.How dare you say that?
D.Sorry, but that's no excuse.
U常见化合价有+4和+6,硝酸铀酰[UO2(NO3)2]加热可发生如下分解。UO2(NO3)2UxOy+NO2↑+
O2↑,在600K时,将气体产物集于试管并倒扣水中,水充满试管。则生成的铀的氧化物化学式是[ ]
A.UO2
B.UO3
C.2UO2·UO3
D.UO2·2UO3