【判断题】尺寸线用粗实线绘制,不能用其他图线代替,也不得与其他图线重合或画在其延长线上。()
【判断题】尺寸线不能用其它图线代替,一般也不得与其它图线重合或画在其延长线上
【判断题】设 A 是 3 阶矩阵,交换矩阵 A 的 1 , 2 两行相当于在矩阵 A 的左侧乘以一个 3 阶的初等矩阵 .
【单选题】– At first he was not good at playing basketball but after a long time of training hard, he stood out. – It’s easy to understand, ____________________.
A.
Make hay while the sun shines.
B.
Practice makes perfect.
C.
The early bird catches the worm
D.
Actions speak louder than words.
【简答题】设A是3阶方阵,将A的第1列与第2列交换得矩阵B,再把矩阵B的第2列加到第3列得矩阵C,则满足AQ=C的可逆矩阵Q为?
【简答题】设A是3阶方阵,将A的第1列与第2列交换得矩阵B,再把矩阵B的第2列加到第3列得矩阵C,则满足AQ=C的可逆矩阵Q为
【单选题】At first he refused to admit he had stolen but when he was shown the videotape, he _______ and admitted everything.