采用基2-DIT-FFT算法计算序列的N点FFT，假设N=2M，那么其运算量大约是_____次复乘运算。
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举一反三
- 下列结论不正确的是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/903dc792ad1c4b8ba36246edced45e2e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/b0d73b80b2734bb6b37cd96300e46fa3.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/b71e248464754f2f9cf39c6c2bef2a49.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/dc30dde832db4b9294ee2e29292180dc.png" />
- 以下哪些图片可表示马太效应？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/9f53557496f648f294946ddeee28f835.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/fd1d1c8153324ff58fec7e98aafa4765.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/998d04a09cb545d1aa9cd734208a020f.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/c67cb20670694e0ea0e3e63a3d083975.png" />
- 满足下列哪种条件的序列称为共轭反对称序列________________。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/6f863bbc8ebe4bf6ae1cd9dac3c3ed35.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/d236b2f70770439e90970575096b4e8a.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/d6001dee52dd461ea635a85cf670a223.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/e93566380bac4600b77f3bc5c90b5971.png" />
- 在有机合成中保护羰基的常用试剂是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/371d833b0e4f4b089b6d370f81115237.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/f4e3ab0a87704e6e835c94027c494801.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/7c7c482b43fe422c88bdd075b3a0b984.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/a3a58d1832fd4ebdb3be9bc2dd9a1d01.png">
- 以下哪个结构流图对应的是IIR滤波器？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/004c7c38e68d441093257571330500b2.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/666abf96f5e64a438faf00a0a678434a.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201810/7641806854794e039629fe56c2c53424.png" />