【简答题】The _____(discuss) is very hot. H e is _____(friend) to all of us. This is an ____(难忘的) holiday. He was attracted by the girl's _____(美丽) It is _____(harm) to smoke for young people. A lot of people t...
【单选题】What can we learn from the story?
A.
The girl's aunt got the news about the finding of a girl in the newspaper.
B.
Mrs Ruth Li's daughter was too young to speak.
C.
Mrs Ruth Li's sister made a long voyage to New York and recognized the girl.
【单选题】在下列实验操作中,肯定不会产生淡黄色沉淀的是
【判断题】饱和氢硫酸 (H2S) 溶液中 H+(aq) 与 S2-(aq) 浓度之比不为2:1。
【简答题】Was the young girl's case exceptional?
【单选题】已知 K 1 (H 2 S)=9.1×10 -8 .K 2 (H 2 S)=1.1×10 -12 . 则饱和氢硫酸溶液中 C(S 2- ) 是
【判断题】饱和氢硫酸( H 2 S )溶液中 H + ( aq ) 与 S 2- ( aq ) 浓度之比为 2 : 1 。
【判断题】饱和氢硫酸 (H 2 S) 溶液中 H + (aq) 与 S 2- (aq) 浓度之比不为 2:1
【单选题】已知氢硫酸的 K 1 = 9.1 ́ 10 -8 、 K 2 = 1.1 ́ 10 -12 , 将硫化氢通入 [H + ] = 0.1 mol / L的溶液中达到饱和,此时溶液中 [S 2- ] 为( )。
【单选题】下列实验过程中产生的现象与对应的图形相符合的是( )
D.
CO 2 通入饱和Na 2 CO 3 溶液中