SCE是(  )。

SCE是(  )。 A.染色单体交换 B.姐妹染色单体交换 C.染色单体内换 D.染色单体互换 E.姐妹染色体交换

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根据下列材料,请回答题In the United States alone, over 100 million cell

根据下列材料,请回答题In the United States alone, over 100 million cell-phones are thrown

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根据下列材料,请回答题According to the Code, visitors should act ______

根据下列材料,请回答题According to the Code, visitors should act _______ .A.with care and r

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染色体断裂后不重接则不能形成下列哪种形态学改变(  )。

染色体断裂后不重接则不能形成下列哪种形态学改变(  )。 A.无着丝粒断片 B.染色体缺失 C.环状染色体 D.微核 E.微小体

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Much time _____ sitting at a desk, office workers are genera

Much time _____ sitting at a desk, office workers are generally troubled by heal

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