| 单词 | 保护膜 |
| 释义 | 〔methylal〕A colorless flammable liquid, CH3OCH 2OCH 3, used as a solvent and in the manufacture of perfumes, adhesives, and protective coatings. 甲缩醛：无色易燃液体，CH3OCH 2OCH 3，用作溶剂，也用在香水、粘着剂和保护膜层的制造中 〔hafnium〕A brilliant, silvery, metallic element separated from ores of zirconium and used in nuclear reactor control rods, as a getter for oxygen and nitrogen, and in the manufacture of tungsten filaments. Atomic number 72; atomic weight 178.49; melting point 2,220°C; boiling point 5,400°C; specific gravity 13.3; valence 4. See table at element 铪：一种锆矿中分离出来的亮银色金属元素，用于核反应堆的控制棒，可形成氧气和氮气的保护膜，还用于钨丝的制造。原子序数72；原子量178.49；熔点2,220°C；沸点5,400°C；比重13.3；原子价4 参见 element |
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