In 12-TET, you divide up the octave into twelve equally-sized semitones (the interval between two adjacent piano keys or guitar frets). To go up a semitone from any note, you multiply its frequency by the 12th root of 2 (about 1.05946). To go down a semitone from any note, you divide its frequency by the 12th root of 2. If you go up by an octave (twelve semitones), you’re multiplying your frequency by the 12th root of 2 twelve times, which works out to 2. That’s a perfect octave, hooray! Unfortunately, you can’t exactly create the other harmonics-based intervals by adding up 12-TET semitones; you can only approximate them.
UK politics live – latest updates
，这一点在新收录的资料中也有详细论述
FirstFT: the day's biggest stories
对于“缺的”，加快攻关突破。全链条推动集成电路、工业母机、高端仪器等重点领域关键核心技术攻关取得决定性突破，提升产业链自主可控水平。
from bs4 import BeautifulSoup