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【单选题】
对滴有酚酞试液的下列溶液，操作后颜色变深的是 ( )A.
AlCl 3 溶液中再溶入AlCl 3
B.
CH 3 COONa溶液加热
C.
氨水中加入少量NH 4 Cl固体
D.
醋酸溶液加热
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举一反三
【简答题】NaOH(C 1 )+NH 3 (C 2 )水溶液中的质子条件式______。
【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.
【简答题】1987年在内地组建了第一家股份制的的商业银行 即 。
【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
【多选题】中国古代军事思想发展的两个高峰是()。
A.
萌生时期：夏、商、西周时期的军事思想
B.
蓬勃发展时期：春秋战国时期的军事思想
C.
充实提高时期：秦汉至五代时期的军事思想
D.
系统完善时期：宋代至清代前期的军事思想
【简答题】加工单元用到的薄型气缸初始状态为( )。
【简答题】写出下列溶液的质子条件式 c l mol·L -1 NaAc - c 2 mol·L -1 HAc
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