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【单选题】
下列物质中水解并能放出H2的是( )A.
B2H6
B.
NH3
C.
PH3
D.
N2H4
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举一反三
【单选题】Which of the following substance is not Brønsted acid ?
A.
H 3 O +
B.
NH 4 +
C.
NH 2 -
D.
HBr
【单选题】'You are not here to tell me what to do. You are here to tell me why I have done what I have already decided to do,' Montagu Norman, the Bank of England's longest serving governor (1920-1944), is repu...
A.
record
B.
new-letter
C.
announcement
D.
motive
【单选题】电解质溶液中离子迁移数与离子电迁移率成正比,当温度与溶液浓度一定时,离子电迁移率是一定的,则25°C时,0.1mol.dm -3 NaOH中Na + 的迁移数t 1 与0.1mol.dm -3 NaCl溶液中Na + 的迁移数t 2 ,两者之间的关系为:
A.
t 1 =t 2
B.
t 1 >t 2
C.
t 1 2
D.
无法比较
【单选题】电解质溶液中离子迁移数 t i 与离子电迁移率 u i 成正比。当温度与溶液浓度一定时,电迁移率是一定的,则 25 °C 时, 0.1 mol·dm -3 NaOH 中 Na+ 的迁移数 t1 与 0.1mol·dm -3 NaCl 溶液中 Na+ 的迁移数 t2 ,两者之间的关系为:
A.
相等
B.
t1> t2
C.
t1< t2
D.
大小无法比较
【简答题】tell me why?
【单选题】听力原文：Can you tell me why Carl left the office early today? (A) No, nobody told me anything about it. (B) I left the company last year. (C) A later conference will be better. (2)
A.
B.
C.
【单选题】'You are not here to tell me what to do. You are here to tell me why I have done what I have already decided to do', Montagu Norman, the Bank of England's longest-serving governor (1920—1944), is repu...
A.
record
B.
new-letter
C.
announcement
D.
motive
【单选题】Can you tell me why yesterday?
A.
he didn't come
B.
he no come
C.
did he come
D.
didn't he come
【单选题】Can you tell me why yesterday?
A.
you didn't come
B.
did you not come
C.
didn't you come
D.
you don't come
【判断题】I’ve heard an announcement that My flight has been delayed . Could you tell me why? 从广播里得知我的航班延误了，你能告诉我原因吗?( )
A.
正确
B.
错误
相关题目：
【单选题】Can you tell me why yesterday?
A.
he didn't come
B.
he no come
C.
did he come
D.
didn't he come
参考解析：
知识点：
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