【单选题】摇臂钻床的主运动是( )
C.
内立柱固定在底座上,外立柱套在内立柱外面,外立柱可绕内立柱手动回转一周
【判断题】If the number of closed-loop poles is the same as the number of open-loop poles, then the number of individual root-locus branches terminating at finite open-loop zeros is equal to the number m of the...
【单选题】Z37摇臂钻床的外立柱可绕不动的内立柱回转()度。
【判断题】Loop gain is the product of branch transmittances of an open loop.
【单选题】The closed loop system differs from the open-loop system by the____.
B.
presence of a feedback
D.
presence of a computer
【判断题】The Nyquist stability criterion determines the stability of a closed-loop system from its open-loop frequency response and open-loop poles.
【单选题】摇臂钻床的工作特点之一是主轴箱和外立柱可以一起绕内立柱作( )的回转,因此便于加工大中型工件
【单选题】在摇臂钻床的结构组成部件中外立柱可绕内立柱回转()度。
【判断题】Loop gain is the product of branch transmittances of a open loop.
【简答题】Open loop control system