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【单选题】
数据库设计一般不包括( )。A.
逻辑设计阶段
B.
业务设计阶段
C.
概念设计阶段
D.
物理设计阶段
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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】Online distance learning (网上远程教育) is an instructional system which connects learners with educational resources. Students work on their own at home, at work, or at school and communicate with faculty ...
A.
It has more disadvantages than advantages.
B.
It is a learning form. based on internet.
C.
It is not available for some students.
D.
It has only enrichment classes.
【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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