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【单选题】
每个(三者之间)A.
each
B.
every
C.
ever
D.
exact
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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
【简答题】在外电场存在下，0.05mol•kg -1 的LiCl溶液，Cl - 的离子迁移数为0.82，则Li + 的离子迁移数t（Li + ）=（）。
【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】'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
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