If you don’t know exactly where to find the information, you may use one of the many search engines on the Web. （)
查看答案
Business－to－Business electronic commerce could also change the relationships among different groups of companies in the supply chain. （)
The basic categories of business models include（).
A. brokerage
B. advertising
C. community
D. subscription
根据《密码法》的规定，下列哪些密码用于保护国家秘密信息？（)
A. 商用密码
B. 核心密码
C. 绝密密码
D. 普通密码
航站作业的安全规定中要求，在机场、航站装卸邮件时应执行当地有关安全操作规定（)
微信支付 
支付宝支付