若(a-2)2+|b+3|=0,则a=______,b=______.
∵(a-2)2+(b+3)2=0,
∴a-2=0,b+3=0,
∴a=2,b=-3.
故结果为:2,-3.
目前,人们在网上购物往往通过支付宝进行结算,即由买家将货款打到支付宝账户,由支付宝通知发货,买家收到商品确认后指令支付宝将货款转到卖家账户,至此完成一笔网络交易。支付宝的实质是“第三方担保平台”。支付宝的出现
A.使得商品流通不再需要现实的货币
B.会使银行信用卡失去转账结算的功能
C.使得商品交换开始分离为买卖两个阶段
D.有助于买卖双方坚持诚实守信的原则
Tom is very happy now. His father with him ______ at the pool.
[ ]
A. have fun swimming
B. has fun to swim
C. have fun to swim
D. has fun swimming