判断题 As a firm's performance improves and its value increases, the stock price will also increase.

问答题 设无向图对应的邻接矩阵为A，则A中第i上非0元素的个数[填空1]第i列上非0元素的个数（填等于，大于或小于）。

单项选择题 ‎每一条供应链的目标是（   ）‍<b