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由於質數除了2之外全為奇數,由於奇數×奇數=奇數,奇數×偶數=偶數,所以兩個質數的積可能是偶數,也可能是奇數.a和b都是質數,則ab的積的因數除了1和它本身外,還有a和b這兩個因數,所以它們的積一定是合數.故選:C.
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