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【多选题】
结核菌素试验阴性可见于A.
机体免疫反应低下
B.
接种麻疹活疫苗后
C.
结核菌素试验失败
D.
未感染过结核
E.
初次感染结核4～8以内
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举一反三
【单选题】________ wise nation is one good at learning, especially ________ that is good at learning from difficulties.
A.
A; the one
B.
The; one
C.
A; one
D.
The; the one
【单选题】In the late nineteenth and early twentieth centuries, one of the most clearly visible difficulties 【C1】______ teachers in New York schools had to 【C2】______ was how to teach children who did not speak...
A.
which
B.
that
C.
what
D.
whom
【多选题】获取目的基因的方法有多种，下列属于目的基因获取方法的是( )
A.
从基因组文库中获取
B.
从cDNA文库中获取
C.
从含目的基因生物细胞中获取
D.
利用PCR技术获取
【单选题】What do we mean by a perfect English pronunciation? In one【C1】______there are as many different kinds of English as there are speakers of it.【C2】______two speakers speak in exactly the same【C3】______W...
A.
meaning
B.
sense
C.
case
D.
situation
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