hf

解释

同义
hafnium hf atomic number 72
词性
n
解释
a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
示例
None

同义
hf high frequency
词性
n
解释
3 to 30 megahertz
示例
None