农业生产过程中经常出现一年多季搭配种植，这是对哪一结构特征的利用？（） ["时间结构","水平结构","垂直结构","生态环境结构"]
社会主义初级阶段基本路线的思想是在十一届三中全会上开始形成的，因为这次会议（）。 ["确定了解放思想、实事求是的思想路线","放弃了“以阶级斗争为纲”的错误方针","作出了把全党工作重心转移到经济建设上来和实行改革开放的决策","审查和解决了一批重大冤假错案"]
学前教育的公益性指的就是学前教育具有造福公众、让（）获益的性质。 ["儿童","家庭","幼儿园","社会"]
Two sites are using a multisite centralized call processing model. The voice gateway on the remote branch has lost IP connectivity to its Cisco CallManager server. Which feature enables the remote gateway to take the role of the call agent during the WAN failure？ （） ["automated alternate routing （AAR）","Cisco CallManager Attendant Console","real-time protocol （RTP）","Survivable Remote Site Telephony （SRST）"]
试论述宝石内含物在宝石鉴定研究中的意义。
家禽对粗饲料利用率低的原因？
