为什么说班级是学生成长的重要环境。
当许多国人为美丽城市夜景感到骄傲的时候，并没有考虑到：这些所谓的“不夜城”恰恰是中国光污染的重灾区。下列现象中会造成光污染的是（）。 ["汽车车窗玻璃上贴太阳膜","城市建筑大面积安装玻璃幕墙","利用太阳能制氢燃料","用家用汽车代替公交车"]
（）在农产品物流领域主要用于农产品运输车辆的跟踪与三维导航。 ["GSM","RS","GIS","GPS"]
Refer to the exhibit. How would you get the 1.1.1.1 network into the OSPF database？ （） [" Configure RTA as an ASBR"," Redistribute connected routes on RTA into OSPF"," Set up a virtual link between area 1 and area 0"," Set up a virtual link between area 1 and area 2"," Add a static route into RTB and enter it into OSPF"," Place a network 1.1.1.0 0.0.0.0 command into RTB"," Set up a unique router ID on RTA using an RFC 1918 address"," Change area 0 on RTB to area 1"]
声波在传播过程中振幅随传播距离的增大而逐渐减少的现象称为衰减。产生衰减的原因有（） ["吸收衰减","散射衰减","扩散衰减","桩侧土阻力"]
what is ABR？
