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[主观题]
There are ______ political divisions on the island of Great Britain.A.oneB.twoC.threeD.fou
There are ______ political divisions on the island of Great Britain.
A.one
B.two
C.three
D.four
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There are ______ political divisions on the island of Great Britain.
A.one
B.two
C.three
D.four
A、polⅠ由7种亚基组成
B、polⅡ有5′→3′外切核酸酶活性
C、polⅢ是复制起始作用的酶
D、polⅡ对复制中错误进行校读