what does BGP neighbor in active state mean？
Which characteristics are representative of a link-state routing protocol?（） [" provides common view of entire topology"," exchanges routing tables with neighbors"," calculates shortest path"," utilizes event-triggered updates"," utilizes frequent periodic update"]
简述微型生物群落监测法。
单板正常运行的状态为（） ["红灯与绿灯一起闪烁，每秒一次。","绿灯慢闪，每秒一次，红灯灭。","绿灯灭，红灯慢闪，每秒一次。","红灯和绿灯一起灭。"]
某投资组合由三种股票组成，各自的权重分别为30%、30%和40%，三种股票相应的β系数分别为1.0、1.5和2.5，请计算该投资组合的β系数。
带应许的诫命是什么？
