A.與溫度無關(guān),與雜質(zhì)濃度無關(guān) B.與溫度有關(guān),與雜質(zhì)濃度有關(guān) C.與溫度無關(guān),與雜質(zhì)濃度有關(guān) D.與溫度有關(guān),與雜質(zhì)濃度無關(guān)