【简答题】Technology is life easier for some dairy farmers. They use robotic systems to milk their cows. Cows are trained to follow a series of paths that lead to milking stations. Only one cow at a time...
【单选题】The feeding of dairy cows has undergone a _______.
【判断题】The dairy cows in modern factories are fed on grass. As a result, the milk produced by those cows are watery.
【单选题】The feeding of dairy cows has undergone a __________.
【简答题】已知杆 OC 长 ,以匀角速度ω绕 O 转动,若以 C 为动点, AB 为动系,则当 AB 杆处于铅垂位置时点 C 的相对速度为υ r = ( ) ,方向用图表示;牵连速度υ e = ( ) ,方向用图表示。
【简答题】已知杆OC长 ,以匀角速度 ω 绕O转动,若以滑块 C 为动点, AB 为动系,则当 AB 杆处于铅垂位置时,动点 C 的科氏加速度 =________,方向为