单项选择题

“你继续唱啊”中的“啊”读成（）。
A、ya
B、wa
C、nga
D、na

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两个矩阵的行数和列数都对应相等时，就称它们是同型矩阵。

答案：正确

单项选择题

A situation in which firms choose their best strategy given the strategies chosen by the other firms in the market is called a socially-optimal solution.
A、正确
B、错误