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【单选题】
下列量子数取值错误的是( )A.
4, 2, 2, 1/2
B.
5, 0, 0, -1/2
C.
4, 1, 0, 1
D.
3, 1, 1, 1/2
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【简答题】NaOH(C 1 )+NH 3 (C 2 )水溶液中的质子条件式______。
【简答题】写出下列溶液的质子条件式。 ①浓度为c mol.l-1(NH4)2HPO4；②浓度为c mol.L-1NaNO3
【单选题】The appearance of distance learning produces a big effect on the society and leads to the revolution of a whole age.
A.
Y
B.
N
C.
NG
【单选题】By making learning possible anytime and anywhere, distance education is a powerful tool _________ supporting lifelong learning.
A.
to
B.
for
C.
with
【单选题】Sometimes online distance learning can be a problem because ______.
A.
it is not as interesting as face-to-face learning
B.
the learners only have the written text
C.
some students don't know how to organize their time
D.
some learners don't need face-to-face cues
【单选题】Sometimes online distance learning can be a problem because _________ .
A.
learners can’t afford it
B.
learners get too many hints
C.
it involves excessive writing
D.
it is not available at the weekend
【简答题】According to the passage , distance learning is baBy almost any measure , there is a boom in Internet-based instruction . In just a few years , 34 percent of American universities have begun offering ...
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