Hydrobon催化加氢精制hydron.水疗院；水力电pref.表示“水的”、“氢的”hydroxyl free radical羟自由基hydrographic features水文要素hydrochlo- ric acid盐酸hydro-isobaric line等水压线hydroxy ethylthiazole羟乙基噻唑hydrocephalus foramen梗阻性脑积水hydroxy-acid iodide羟基酰碘hydrogeologie feature水文地质特征hydroxyalkylmercaptan羟烷基硫醇hydrostatic weighting液体比重天平测定比重