HF
Hf
HF
hf
Hf
HF
orh.f.
HF
Hf
Chem. Symbol.
Hf
Noun | 1.![]() | 2.HF - 3 to 30 megahertz |
单词 | hf | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
释义 | HFHfHFhfHfHForh.f.HFHfChem. Symbol. Hf
HfHf,symbol for the element hafniumhafnium, metallic chemical element; symbol Hf; at. no. 72; at. wt. 178.49; m.p. about 2,227°C;; b.p. 4,602°C;; sp. gr. 13.31 at 20°C;; valence +4. Hafnium is a lustrous, ductile, silvery metal with a hexagonal, close-packed crystalline structure. ..... Click the link for more information. . HfHFHFHF(High Frequency) A range of radio frequencies from 3 to 30 MHz. The HF band is used for amateur radio, marine, aviation and military communications and high-frequency RFID tags.With regard to audio, high-frequency waves are typically above 3,000 Hz. See frequency bands. HfHFHfHFAbbreviation for:haemofiltration haemorrhagic fever Hageman factor hair follicle haplotype frequency hay fever head of foetus heart failure heat flow Hemochromatosis Foundation high fat high fibre high frequency high fructose hip fracture Hispanic female host factor hot flashes hot flushes human factor human fibroblast humidifier lung hydatid fluid hydrops fetalis hyperfractionated hypoxic fraction HfHF
Hf
Synonyms for Hf
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