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【单选题】
ε(t+3)*ε(t-5)=( )。A.
(t-2)ε(t-2)
B.
(t+3)ε(t-5)
C.
(t-5)ε(t-5)
D.
tε(t)
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举一反三
【简答题】简述常用溶剂的极性分类以及极性排列顺序？
【单选题】当前，我国主要经济指标处于年度预期目标的合理区间，经济社会发展总局是好的。我国发展仍处于可以大有作为的重要战略机遇期。同时，我们要切实增强忧患意识，充分做好应对各种复杂困难局面的准备。中央对我国当前经济形势的分析所坚持的唯物辩证法道理是（）
A.
一切从实际出发，实事求是
B.
既要看到矛盾的主要方面，又要看到矛盾的次要方面
C.
既要看到主要矛盾，又要看到次要矛盾
D.
矛盾具有特殊性，要具体问题具体分析
【单选题】— Whose skirt is this? — It the little girl's, I saw her wear it this morning. [ ]
A.
can be
B.
can't be
C.
must be
D.
mustn't be
【简答题】I saw a little girl ________(run) across the street.
【单选题】The little girl seems to ____a lot since I last saw her.
A.
have been changed
B.
have changed
C.
change
D.
be changing
【简答题】On a Sunday morning, I was driving down a road and saw something I couldn’t believe. A little girl, less than two, was pushing her stroller (婴儿车) across the road. It was Sunday morning and traffic was...
【单选题】When I passed by, I saw a little girl ______ with a dog. [ ]
A.
play
B.
played
C.
was playing
D.
playing
【单选题】将浓度为 0.10mol/L和0.20mol/L的硫酸溶液等体积混合(假设混合后溶液体积为原溶液体积的两倍),所得硫酸溶液的浓度为
A.
大于0.15mol/L
B.
小于0.15mol/L
C.
等于0.15mol/L
D.
无法确定
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