【单选题】下列结论正确的是( )
C.
两个矩阵既可相加又可相乘,这两个矩阵一定是方阵;
【判断题】幼嫩细胞的细胞壁由胞间层、初生壁和次生壁组成。
【简答题】The use of vacuum tubes declined rapidly when a semiconductor device was invented that could perform many of the functions previously associated with vacuum tubes.
【判断题】现代电力网中巨大的电能几乎全部由同步发电机提供。( )
【单选题】下列结论正确的是 ( )
C.
两个矩阵既可相加,又可相乘,这两个矩阵一定是方阵
【多选题】5G网络技术和网络结构将向着虚拟化、软件化、扁平化方向发展,如下与它相关的关联技术是( )