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【简答题】
按 Lewis 酸碱理论,在下列反应中,哪个反应物为酸,哪个反应物为碱? (1)CN - +H 2 O → HCN+OH - (2)H 2 C=O+BF 3 → BF 3 - (3)H 2 0+CH 3 NH 2 +OH - (4)4NH 3 +Cu 2+ → Cu(NH 3 ) 4 2+ (5)COCl 2 +AlCl 3 → + COCl+AlCl 4 - (6)I 2 +I - → I 3 -
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举一反三
【单选题】Don't let your mind ________ the failure of the test.
A.
rely on
B.
count on
C.
take on
D.
dwell on
【简答题】本学期全部实验用到的光源有哪一些?
【单选题】You can ( ) the video camera on a tripod (三脚架), so that you don't have to worry about holding it steady while you ask questions.
A.
withstand
B.
mount
C.
implement
D.
dwell
【单选题】Don't ( ) the past misfortunes. Cheer up!
A.
dwell about
B.
think about
C.
dwell on
D.
think of
【简答题】Change the forms of the words or phrases in the box to fill in the gaps correctly. eliminate stable define...as witness subside make up tolerate complementary dwell on m...
【简答题】It does not do well to dwell on dreams and forget to live, remember that. 2. Guard well your thoughts when alone and your words when accompanied. 3. Once you've been through tough times, you can only ...
【单选题】Please don't ______ too much on the painful memories, Everything will be all right.
A.
hesitate
B.
linger
C.
retain
D.
dwell
相关题目：
【单选题】Don't ( ) the past misfortunes. Cheer up!
A.
dwell about
B.
think about
C.
dwell on
D.
think of
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