Tomorrow is Father's Day. What's your surprise for your father?
The first thing____ I will do is to make a card for him.( )
A.whoB.whereC.whoseD.that
下列变化中,需加入适当的氧化剂才能完成的是
下列各组离子,能在溶液中大量共存的是
下列离子方程式书写正确的是
下列电离方程式不正确的是
下列关于CO的叙述正确的是