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【单选题】
设 H , K 是群( G ,。 )的子群,下面代数系统是( G ,。 )的子群的是( )A.
（ H ∩ K ，。 ）
B.
（ H ∪ K ， 。 ）
C.
（ K-H ，。 ）
D.
（ H-K ，。 ）
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A.
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