影响人耳音高感受的客观因素包括
A、频率
B、声压
C、频谱
D、包络

孙武是中国历史、也是世界历史上第一个有记载的将“用间”提到战略高度来认识，并成功运用于战争实践的伟大军事家，堪...

单项选择题孙武是中国历史、也是世界历史上第一个有记载的将“用间”提到战略高度来认识，并成功运用于战争实践的伟大军事家，堪称世界军事情报学鼻祖。（      ）
A、正确
B、错误

Jaguar has full manufacturing costs of their S-type sed...

单项选择题Jaguar has full manufacturing costs of their S-type sedan of £22,803. They sell the S-type in the UK with a 20% margin for a price of £27,363.  Today these cars are available in the US for 2.01/£.  Jaguar has committed to keeping the US price at 2.15/£, and Jaguar has not hedged against currency changes, what is the percentage margin the company will realize given the new exchange rate?  
A、20.0%  
B、15.3%
C、12.2%
D、7.2%

利用线性相位FIR滤波器的对称（或反对称）性质，可以减少近一半数量的乘法器。 A、正确 B、错误

单项选择题利用线性相位FIR滤波器的对称（或反对称）性质，可以减少近一半数量的乘法器。
A、正确
B、错误