Which spectrum band of follows does NOT belong to optical spectrum band? A: O-band B: C-band C: L-band D: X-band

C-band为5G网络的主用频段，下列关于C-band的描述，正确的有： A: C-band是NR新增频段，频谱资源丰富 B: C-band支持的小区带宽最大可以达到100MHz C: 采用C-band组网时，上行链路覆盖较差，上下行不平衡问题比较明显 D: C-band频段低，覆盖性能好

The energy level structure of semiconductor materials is not a discrete single-valued energy level, but a band structure with a certain width, called . A: Energy band B: Valence band C: Conduction band D: Forbidden band

On May.25, 1992 the British music newspaper Melody Maker featured a band on the cover with the headline "The Best New Band in Britain" before the band released their first single. The band is _________.

C-band为目前5G主要频段。（ ）

On May.25, 1992 the British music newspaper Melody Maker featured a band on the cover with the headline "The Best New Band in Britain" before the band released their first single. The band is _________. A: . U2 B: . Coldplay C: . Suede D: . The Cranberries

(4) A. bank B. band A: bank B: band

band

There is a certain type of band called a boy band. What is a boy band? </p></p>

‍The scale band is:​ A: Linear horn belt B: Index band C: Exponential horn belt D: None of the above