英文字典中文字典Word104.com
|
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!
英文字典中文字典相關資料:
|
中文字典-英文字典 2005-2009
|中文姓名英譯,姓名翻譯 |简体中文英文字典