（）是判断宗族和宾客的标准。 ["有无阶级关系","有无姻亲关系","有无血缘关系","有无利益关系"]
目前我国土地资源开发利用的主要对策有（） ["加强以水利建设为中心的农田基本建设","改造中低产田","积极开发宜农荒地资源","加强开发海洋滩涂资源"]
游戏作为幼儿园课程重要的组成部分，可以促进幼儿各种能力的发展，但是并不有益于幼儿进行幼儿园各学科（领域）课程的学习。
联邦国家属于（） ["单一制国家","复合制国家","C被保护国","附庸国"]
Which two statements are true about the protocols that are used for transmitting voice traffic？（） ["RTP multiplexing is used to keep multiple phone conversations separate","RTP provides end-to-end delivery services for voice traffic.","UDP is used to ensure a reliable transmission from sender to receiver.","RTP is used to provide resource reservation for the voice stream.","UDP provides multiplexing of multiple phone conversations."]
农业景观有什么意义？
