【简答题】设A=(a ij ) 3×3 ,B=______. (A)AP 1 P 2 (B)P 1 AP 2 (C)AP 2 P 1 (D)P 2 AP 1
【简答题】分数时滞影响系统稳定性的原因在于________________是分数时滞的函数,分数时滞的变化将会使闭环系统特征根的位置发生变动,从而影响了系统的稳定性能。
【单选题】Have you ever argued ________ your parents? [ ]
【简答题】如果点P是线段AB的黄金分割点,且AP>PB,则下列说法正确的是______(仅填序号). ①AP 2 =PB?AB;②AB 2 =AP?PB;③BP 2 =AP?AB;④AP:AB=PB:AP.
【单选题】---Where are your parents? ---They ______ to England.
【单选题】— Where are your parents? — They ____ Shanghai. They will be back in two days.
【单选题】TWC(三元催化转换器)的安装位置在( )。