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【简答题】
光学异构体药物表现出的性质中最为罕见的是: A. 活性强弱不同 B. 具有相同的活性 C. 出现相反的活性 C. 一个异构体有活性,另一个异构体没有活性
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举一反三
【单选题】Great Changes have taken place since then in the factory we are working.
A.
where
B.
that
C.
there
D.
which
【单选题】Great changes ahve taken place since then in the factory we are working.
A.
where
B.
that
C.
which
D.
there
【单选题】Because of the recent fire in the factory, all the stocks were destroyed. (), we cannot make shipment as arranged before.
A.
In the case
B.
In this cases
C.
In this event
D.
At this event
【单选题】The river by waste products from the factory. We can find no fish in it.
A.
has polluted
B.
will pollute
C.
has been polluted
D.
will be polluted
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