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HPF : 1）highest possible frequency ??
HP / H.P. / hp / h.p. : 1）horsepower馬力
HF : 1）high frequency 短波、高周波
HPU : 1）hydraulic power unit 水力発電装置
HCF : 1）highest common factor 最大公約数
HOW : 1）howitzer りゅう弾砲
HO : 1）head office 本社、 Home Office 《英》内務省
HND : 1）Higher National Diploma (英国の)高等一級技術検定合格証
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HPF

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