下列物质中氮元素化合价最低的是 [ ]
A.N2
B.NH3
C.NO2
D.HNO3
答案:B
Are you going to the football game?
— No, the tickets are ________ for me.
A.too much high
B.so much expensive
C.far too expensive
D.highly expensive
用水灭火时,水喷嘴至带电体的距离110KV及以下应大于()m。
A、1
B、2
C、3
D、4