In 1845, Mexican-American war erupted. America defeated Mexico and occupied a large area of its land(today’s Texas).
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In September 2015, Chinese president Xi Jinping put forward the concept of building the new Silk Road economic belt and the 21st Century Maritime Silk Road for the first time.
A. 对
B. 错
当不同变换区间长度与N成倍数关系时,即N'=rN,N'点的DFT结果为G(k),N点的DFT结果为X(k),则G(k)的谱线要比X(k)的()且( )
A. 疏;完全重合
B. 疏;部分重合
C. 密;完全重合
D. 密;部分重合
L>N时,对L点时序列进行N点DFT变换,其结果________(会/不会)失真。