实现下列变化,必须加入氧化剂或还原剂的是
A.NO2→HNO3
B.NH4+→NH3
C.Cl2 →HClO
D.NH3→NO
答案:D
–There is _______ on using mobile phones at the gas station.
--Do you mean talking on the mobile phone ________ at the gas station?
A.a ban; is banned
B.ban; banned
C.a ban; banned
D.ban; is banned
()的人矫正化妆时,不能将提亮色从鼻根至鼻头直线运用,以免会产生更加延长鼻部的效果。
A.中庭长
B.中庭短
C.上庭长
D.下庭长