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【单选题】
下列关于线粒体DNA遗传特征说法不正确的是:A.
mtDNA在一个细胞中有具有多达数百到数万个拷贝。因此，mtDNA的突变率可以在0和100%之间任意变化。
B.
瓶颈效应可能用来解释一些线粒体疾病具有很高的家族间临床变异性。
C.
一个细胞中的mtDNA分子不需要占到一定比例就可以检测到其遗传突变。
D.
异质性母亲的孩子通常会有平均水平大大不同的异质性突变。
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【单选题】听力原文： Officials say water levels along the Brahmaputra River still are at dangerous levels although they are dropping. The officials say flooding has destroyed the homes of two and one half million pe...
A.
More than 120.
B.
About 200.
C.
Two and one half million.
D.
Not mentioned.
【单选题】The rise in water levels is especially dangerous for small island nations and __.
A.
low-lying urban areas
B.
all coastal cities
C.
people who live on the beach
D.
Shanghai
【单选题】听力原文： India—Officials say water levels along the Brahmaputra River still are at dangerous levels although they are dropping. The officials say flooding has destroyed the homes of two and one half mill...
A.
they are not rising
B.
they are falling
C.
the rain has stopped
D.
it's clearing up
【简答题】MySQL 提供【 】语句用于删除表中的数据。
【简答题】凡经互感器接入的电度表，其读数要( )互感器的变化才是实际读数值。
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