a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
同义词:hafnium??/??Hf??/??atomic number 72
3 to 30 megahertz
同义词:high frequency??/??HF
Let's go through this calculation for HF.
我们把H,F数据代入检验这个公式。
固态化学导论课程节选 : 麻省理工公开课
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