题目内容

In 1975, communist forces ended the war by seizing control of South Vietnam, and the country was unified as the Decomatic Republic of Vietnam the following year.

A. 对
B. 错

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In 1845, Mexican-American war erupted. America defeated Mexico and occupied a large area of its land（today’s Texas）.

A. 对
B. 错

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

N点DFT的周期为_____。