Which site-to-site VPN solution allows Cisco routers, PIX Firewalls, and Cisco hardware clients to act as remote VPN clients in order to receive predefined security policies and configuration parameters from the VPN headend at the central site?（） [" Easy VPN"," GRE tunneling"," Virtual Tunnel Interfaces"," DynamicMultipoint VPN"," Group Encrypted Transport VPN"]
中国石油加油站管理系统涉及了中国石油加油站（）相关的业务信息领域。 ["油品","便利店","零售","批发"]
成本会计的对象是（）。 ["产品生产成本的形成","各项期间费用的支出和归集","生产费用和期间费用","各行业企业生产经营业务的成本和有关的期间费用"]
Which routing protocol supports a flexible area structure using routing levels one and two?（） ["OSPF","EIGRP","IS-IS","BGP"]
下列钢材中属于合金钢的是（）。 ["20","40Cr","ZG200—400","H62"]
小学儿童认知活动的发展主要表现在哪些方面？
