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hf    
n. high frequency（高频）的简写

high frequency（高频）的简写

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]


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  • Hydrogen fluoride - Wikipedia
    HF is diatomic in the gas phase As a liquid, HF forms relatively strong hydrogen bonds, hence its relatively high boiling point Solid HF consists of zigzag chains of HF molecules
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  • Hydrogen Fluoride | Chemical Emergencies | CDC
    Background Hydrogen fluoride is a chemical compound (made up of two or more elements) that has the element fluorine It can be a colorless gas or a fuming liquid, which means it creates gas vapors It can also be dissolved in water When hydrogen fluoride is dissolved in water, it may be called hydrofluoric acid Hydrogen fluoride can be made when other compounds with fluoride, such as
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  • Information on Hydrofluoric Acid - Stanford University
    Hydrofluoric acid, a solution of hydrogen fluoride gas (HF) in water, is one of the most corrosive and dangerous chemicals encountered in the laboratory Exposure to HF can cause severe tissue damage and even death
  • Classes and Stages of Heart Failure - American Heart Association
    Cardiac Resynchronization Therapy (CRT) Complementary and Alternative Medicines Physical Changes to Report Your Heart Failure Health Care Team Help for Heart Failure Caregivers Advanced Heart Failure Recognizing Advanced Heart Failure Planning for Advanced Heart Failure Making Shared Decisions Living With HF Guide Questions to Ask Your Doctor
  • Hydrofluoric Acid | HF | CID 14917 - PubChem
    - For small fires involving UN 1790, hydrofluoric acid (HF), use carbon dioxide, dry chemical, dry sand, or alcohol-resistant foam - For large fires involving UN 1790, use water spray, fog, or alcohol-resistant foam
  • Harbor Freight - Facebook
    Surface Conditioning Tool! Learn more here: https: hf tools www70981 Octavio Ricky C Nieto and 112 others 󰍸 113 󰤦 2 Harbor Freight󱙄 1d· 󰟠 󳄫
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    HF Custom Solutions is an absolute rock star of a partner, one that I have thoroughly enjoyed working with on various projects involving custom printing, signs, t-shirts, jackets, Yeti’s, notebooks and so much more





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