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A,9和,10,這兩個數都是合數,又是互質數,而且它們的最小公倍數是90;B,2和45,2是質數,45是合數,不符合要求;C,6和15,都是合數,不符合題意;D.5和18,5是質數,不符合要求;故選:A.
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