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【判断题】
3-10、H2C2O4的两步离解常数为Ka1=5.6 × 10-2,Ka2=5.1 × 10-5,因此不能分步滴定。( )A.
正确
B.
错误
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【简答题】互联网是21世纪人类伟大的基础性科技发明。()
【简答题】短文填词 Do you like friends who can teach you a lot every day?Books are s ________friends that they bring knowledge to us and keep us company through our life.They are so valuable that________(图书馆) are b...
【简答题】五、短文填词 Do you like friends who can teach you a lot every day? Books are s friends because they bring knowledge to us and keep us ____(陪伴) through our life. They are so valuable that libraries are b...
【单选题】Linda's friends were all concerned ______ books and music.
A.
with
B.
of
C.
for
D.
at
【单选题】(48143)路肩宽度:线路允许速度不大于160km/h的路堤地段不得小于0.8m,路堑地段不得小于()。
A.
0.4m
B.
0.6m
C.
0.8m
D.
1.0m
【单选题】The people we meet in books may delight us as our companions and friends. It means .
A.
we can meet new people as our companions by reading books.
B.
we can delightfully regard the character in the books as our friends.
C.
our friends can be our reading companions when reading books.
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