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【多选题】
在国际上，工程建设物资采购的常用模式有（）。A.
业主方自行采购
B.
行政制定采购
C.
承包商采购
D.
与承包商约定指定供应商采购
E.
行业协会统一采购
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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】Our math teacher ______ in our school for 20 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
【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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