hf
n .
high frequency （高頻）的簡寫
high frequency （高頻）的簡寫
Hf n 1 :
a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals ;
used in filaments for its ready emission of electrons [
synonym :
{
hafnium }, {
Hf }, {
atomic number 72 }]
2 :
3 to 30 megahertz [
synonym : {
high frequency }, {
HF }]
Hydrofluoric \
Hy `
dro *
flu *
or "
ic \,
a . [
Hydro -,
2 fluoric .]
(
Chem .)
Pertaining to ,
or containing ,
hydrogen and fluorine ;
fluohydric ;
as ,
hydrofluoric acid .
[
1913 Webster ]
{
Hydrofluoric acid } (
Chem .),
a colorless ,
mobile ,
volatile liquid , {
HF },
very corrosive in its action ,
and having a strong ,
pungent ,
suffocating odor .
It is produced by the action of sulphuric acid on fluorite ,
and is usually collected as a solution in water .
It attacks all silicates ,
as glass or porcelain ,
is the agent employed in etching glass ,
and is preserved only in vessels of platinum ,
lead ,
caoutchouc ,
or gutta -
percha .
[
1913 Webster ]
安裝中文字典英文字典查詢工具! 中文字典英文字典工具:
複製到剪貼板
英文字典中文字典相關資料:
Trades Rumors Free Agency | HFBoards - NHL Message Board and Forum . . . HFBoards - NHL Message Board and Forum for National Hockey League Montreal Canadiens | HFBoards - NHL Message Board and Forum for . . . National Hockey League Talk - HFBoards Edmonton Oilers | HFBoards - NHL Message Board and Forum for National . . . ROHS与HF本质区别？ - 知乎 Pittsburgh Penguins | HFBoards - NHL Message Board and Forum for . . . 2025 hf boards OHL Priority Mock Draft HF Habs: Trade Proposal Thread #93: Yall got any more of . . . - HFBoards Toronto Maple Leafs | HFBoards - NHL Message Board and Forum for . . .