【单选题】平面四杆机构存在曲柄的条件中,曲柄为最短构件,最短与最长构件长度之和()其他两构件长度之和。
【单选题】Who traveled in Xi'an?
【简答题】设A是三阶实对称矩阵,r(A)=1,A 2 一3A=0,设(1,1,一1) T 为A的非零特征值对应的特征向量.(1)求A的特征值;(2)求矩阵A.
【单选题】平面四杆机构存在曲柄的条件中,曲柄为( )构件,最短与最长构件长度之和( )其它两构件之和
【单选题】Ted, there’s a boy at front door who says he has news for you.
【简答题】设A 为2 阶实对称矩阵 ,R(A)=2 且 , 求矩阵A 的特征值为 = , = , = (特征值按照从小到大的顺序写);特征向量 = , = , = ;并求出矩阵A= ; = .
【简答题】在平面四杆机构中,最短杆与最长杆的长度之和 其余两杆的长度之和时,则不论取哪个杆作为 ,都可以组成双摇杆机构。
【单选题】听力原文:W: Ted, I'm leaving you. Ted, here are my keys. Here's my American Express Card, my Bloomingdale's Credit Card, and my check book. I've taken 2,000 dollars out of our savings account because that...
B.
Her American Express Card.
C.
Her Blooming dale's Credit Card.
【判断题】人被捕鸟蛛咬伤后,咬伤处剧烈疼痛,如刀割一般,若不处理会导致而死。
【简答题】设A为三阶实对称矩阵,且满足条件A 2 +2A=0,已知A的秩r(A)=2,