Of course, as long as your card is activated, the card status is normal and the credit limit is sufficient, you can use it alone. It doesn't matter. But the CCB credit card in your name is shared, not accumulated. Suppose your A card credit limit is 10000 and your B card credit limit is 20000, then the maximum sum of the two cards can be 20000 instead of 30000. In addition, after you spend all your money with a credit card, you have to repay it according to the card number every month.