简述秘书监的发展、设立、兴盛。
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。
对于企业来讲，标志最终目的是助于（） ["传递信息","促进销售","美化产品","树立形象"]
酸雨源于大气中的（） ["碳氢化合物","碳氧化物","硫氧化物","氮氧化物"]
简述免疫球蛋白的生物学功能。
