1. CCB's credit card has been swiped with dual RMB, but the US dollar account has a limit and cannot be swiped. Because it is a line shared by two currencies, that is, the total amount of the two currencies is the line of this credit card.

2. Dual-currency card is a kind of bank card that only appeared in China in recent years. With the continuous development of China's economy and the continuous improvement of people's living standards, traveling and shopping abroad has become a very common thing, thus forming a wide demand for bank cards settled in foreign currency. Therefore, many domestic banks have successively cooperated with international bank card organizations such as VISA and MasterCard to launch bank cards with RMB and USD settlement functions. In China, RMB settlement can be realized through UnionPay. After going abroad, you can spend and withdraw cash at ATMs of merchants and banks that support Visa or MasterCard, and settle in US dollars.

3. All credit cards issued by China Construction Bank are named "Longka". At the same time, China Construction Bank, as a state-owned bank that set foot in issuing credit cards earlier in China, has a wide variety of credit cards at present. At present, the types of dragon cards that have been publicly issued are: Dragon Card Campus Card, Dragon Card Business Card, Dragon Card Automobile Card, China Eastern Airlines Dragon Card, Shanghai Volkswagen Dragon Card, Dragon Card Hong Kong Wonderful Travel Credit Card, China Construction Bank VISA Card, Yilong Changxing Dragon Card, Mango Travel Dragon Card and Dragon Card (Masters Cup) Tennis Card.