单项选择题

There is no doubt that the military strength in many countries, like the US is one of the key elements______________, called “a nation’s strength”.

A．in power plant
B．in soft power
C．in PowerPoint
D．in hard power

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产权比率的计算公式

答案：负债总额/股东权益总额

单项选择题

信号f()=Sa(100t),其最低取样频率fs为( )()。
A、
B、
C、
D、