Both indicators may often have “bugs”, that is, indicators that show various important speeds and altitudes, such as V speeds calculated by a flight management system, do-not-exceed speeds for the current configuration, stall speeds, selected altitudes and airspeeds for the autopilot, and so on.
你? 们 , 去 上? 边 , 后 桅 上 桅帆 ,? 别 管? 灯 了 !LASER-wikipedia2 LASER-wikipedia2