题目内容
(请给出正确答案)
[单选]
Suan:Oh,no! The door and the window()!Victor:Who could have done this?Suan:Go in quickly and see if we've lost anything.
A、are breaking
B、have broken
C、were broken
D、will break
查看答案
A、are breaking
B、have broken
C、were broken
D、will break
A、Sn(OH)2、Sn(OH)4酸性依次增强
B、Sn(OH)2、Pb(OH)2碱性依次增强
C、Sn(OH)2、Pb(OH)2均显两性
D、Pb(OH)2只显碱性,Sn(OH)4只显酸性