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【简答题】
吸收操作的基本依据是（），精馏操作的基本依据是各组分间挥发度的差异。
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【单选题】10 years ago， _________ only one classroom building in our school. And in 10 years， _________ five classroom buildings in our school.
A.
there will be, there are
B.
there was, there will be
C.
there will be; there was
D.
there was, there are
【单选题】Our town has been added to these years. It is no longer ________ it was 15 years ago, ________ it was poor and untidy.
A.
what; which
B.
that; which
C.
which; that
D.
what; when
【单选题】Our teacher ____ in our school for 29 years and he ____ here when he was 23 years old.
A.
has taught has come
B.
taught , comes
C.
taught , came
D.
has taught, came
【单选题】When did For Our Kids begin?
A.
2 years earlier
B.
3 years earlier
C.
4 years earlier
D.
5 years earlier
【简答题】如图所示电路中,方框代表电源或电阻,各支路上电流的参考方向如图所示,则I1=( ),I2=( )。
【单选题】No one knows what _______ in fifty years.
A.
will our life be like
B.
is our life like
C.
our life will be like
D.
our life is like
【简答题】如图所示的电路，求电流i 1 和i 2 。
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