智慧职教: 扩展频谱（SS:Spread Spectrum)通信简称扩频通信。
智慧职教: 扩展频谱（SS:Spread Spectrum)通信简称扩频通信。
扩频通信技术，即扩展频谱通信（Spread Spectrum Communication），它与（）一同被誉为进入信息时代的三大高技术通信传输方式。 A: A光纤通信 B: B无线通信 C: C卫星通讯 D: D宽带通讯
扩频通信技术，即扩展频谱通信（Spread Spectrum Communication），它与（）一同被誉为进入信息时代的三大高技术通信传输方式。 A: A光纤通信 B: B无线通信 C: C卫星通讯 D: D宽带通讯
The news quickly ________ among thesoldiers. A: was spread B: spread C: have spread D: were spread
The news quickly ________ among thesoldiers. A: was spread B: spread C: have spread D: were spread
Antibacterial spectrum是指 （ ）
Antibacterial spectrum是指 （ ）
Which spectrum band of follows does NOT belong to optical spectrum band? A: O-band B: C-band C: L-band D: X-band
Which spectrum band of follows does NOT belong to optical spectrum band? A: O-band B: C-band C: L-band D: X-band
扩频（spread-spectrum）技术是使用ISM频带传输无线数据的基础。 A: 正确 B: 错误
扩频（spread-spectrum）技术是使用ISM频带传输无线数据的基础。 A: 正确 B: 错误
U408What new threats does globalization bring? A: The quick spread of perishable items. B: The quick spread of wildfire. C: The quick spread of disease. D: The quick spread of the labor-force.
U408What new threats does globalization bring? A: The quick spread of perishable items. B: The quick spread of wildfire. C: The quick spread of disease. D: The quick spread of the labor-force.
The continuum spectrum of X ray comes from ( )
The continuum spectrum of X ray comes from ( )
________ the scandal among his colleagues, Mr. Williams would have been promoted to the position as director. A: . If he did not spread B: . Had he not spread C: . Did he not spread D: . Should he not spread
________ the scandal among his colleagues, Mr. Williams would have been promoted to the position as director. A: . If he did not spread B: . Had he not spread C: . Did he not spread D: . Should he not spread
The power spectrum of white Gaussian noise follows Gaussian distribution.
The power spectrum of white Gaussian noise follows Gaussian distribution.