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."]
下列宝石能出现双臂或单臂干涉图的是（） ["电气石","尖晶石","托帕石","锆石"]
军事法的基本原则，是指
正规的健康教育只可以通过幼儿园课程中与健康直接有关的学科或领域教育活动（如体育、运动、健康等）进行。
韵律常包括（）、交替韵律、渐变韵律三种形式。
