商业信用不利于促进商品销售，且存在范围有限的局限性。（）
参考答案：错
— _____?
— I'd like to buy a pair of shoes. [ ]
A. What are you looking for
B. Do you want to buy something
C. What do you want
D. Can I help you
CDMA20001XEV-DO用户接入网络时的身份认证将不通过HLR进行，而是通过AN-AAA进行身份认证。
