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【单选题】
可用于基因工程载体的DNA分子有A.
染色体DNA
B.
噬菌体DNA
C.
细菌DNA
D.
病毒DNA
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【单选题】This morning our head teacher came to school _________ than ________ student in our class.
A.
much early; any
B.
much earlier; any
C.
much early; any other
D.
much earlier; any other
【简答题】按误差的表示方法,误差可分为 和 。
【单选题】This morning our head teacher came to school _________ than ________ student in our class.
A.
much early; any
B.
much earlier; any other
C.
much early; any other
D.
much earlier; any
【简答题】误差的表示方法分为____和___
【单选题】Our English teacher came to our school __________.
A.
in her thirty
B.
on her thirties
C.
on her thirty
D.
in her thirties
【单选题】While we______ with the president, our English teacher came in.
A.
are talking
B.
were talking
C.
would talk
D.
have talked
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