相同浓度的 CO 3 2- 、 S 2- 、 C 2 O 4 2- 三种碱性物质水溶液 , 其碱性强弱 ( 由大至小 ) 的顺序是 ( ) 。 ( 已知 H 2 CO 3 p K a1 = 6.38 p K a2 = 10.25 ; H 2 S p K a1 = 6.88 p K a2 = 12.92 ; H 2 C 2 O 4 p K a1 = 1.22 p K a2 = 4.19 )
【简答题】Directions: There are 5 incomplete statements here. You should fill in each blank with the right preposition. 6. The boys felt sad as they lost ________ the girls in the talk show. 7. Jack has studied...
【简答题】The boys felt sad as they lost ________ the girls in the talk show. Jack has studied Chinese in this school _______ the year of 2000. Children wake up very early _ __ the morning of Christmas Day. The...