由于财务假定，计算现金流量时，就可以把营业收入和经营成本都看作是在年末发 生的。
请简述IP地址的分类方法，并说明什么是IP子网，划分IP子网有什么作用？
胎粪的排出在出生后12小时，为墨绿色，喂奶后很块转为含奶块的金黄色，若24小时不见胎粪排出，要警惕（）畸形。 ["酶系统","泌尿系统","呼吸道","消化道"]
资产阶级最基本的道德规范是（）。
Your company uses DHCP to lease IPv4 addresses to computers at the main office. A WAN link connects the main office to a branch office. All computers in the branch office are configured with static IP addresses. The branch office does not use DHCP and uses a different subnet. You need to ensure that the portable computers can connect to network resources at the main office and the branch office. How should you configure each portable computer？（） ["Use a static IPv4 address in the range used at the branch office.","Use an alternate configureation that contains a static IP address in the range used at the main office","Use the address that was assigned by DHCP as a static IP address","Use an alternate configuration that contains a static Ip address in the range used at the branch office."]
三视图的投影规律是什么？
