hf

hf读音音标

hf意思解释

abbr.

half 半；

hard firm 坚硬（铅笔芯）；

hard finish(ed) 缓硬的；

hard-faced 表面硬化的

英英释义

n.

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：hafniumatomic number 72

3 to 30 megahertz

同义词：high frequency