What is the MAC address that comes from the multicast address 239.255.0.1?（） [" 01 - 00 - 5e - 7f - 00 - 01"," 01 - 01 - ef - ff - 00 - 01"," 00 - 00 - 00 - 7f - 00 - 01"," 10 - 00 - ef - ff - 00 - 01"]
浅埋和深埋隧道的分界的计算是根据（）来确定的。 ["围岩类别","隧道横断面大小","埋深","隧道的施工因素"]
信息量巨大的网站一般采用的布局具有哪些特点（） ["采用规则型版式","图文率中以文字为主","稳定感大于自由感","图片多为出血"]
避免阳光直接照射仪器，其目的是（） ["防止仪器老化","防止视准轴偏差","保护水准器灵敏度","防止脚架扭曲"]
What the output？（）
流媒体有哪些格式？各有什么特点？
