下列对于大气圈各圈层的描述正确的有（） ["对流层空气分布均匀，高度分布不均匀","平流层臭氧集中，尘埃很少，透明度高","中层大气在其中进行强烈的化学反应","热层即电离层，大气温度随高度增加"]
Which statement describes the distributed call control model in VoIP networks？（） ["The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardown","The gateway voice-capable device has a local call routing table configured through a routing protocol.","The gateway voice-capable device relies on a call agent to support call control.","The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown."]
热处理的主要目的是为了（） ["去有机宝石和部分无机宝石的杂色色调","使宝石的颜色、透明度、光学效应等得以改善","增强反光亮度和产生光学效应","产生较为鲜艳的颜色"]
下列属于兼营再保险业务的保险公司有（） ["中国人民保险公司","中国太平洋保险公司","中国平安保险公司","中国再保险公司","瑞士再保险公司"]
按照婴儿期健康体检标准，婴儿在出生后一年内进行（）次的定期健康检查。
色度测定时，去除水样中的悬浮物有哪些方法？
