| 单词 | 密封装置 |
| 释义 | 〔gland〕A device, such as the outer sleeve of a stuffing box, designed to prevent a fluid from leaking past a moving machine part.密封装置，密封套：一种装置，比如填充函的外套，设计出来以防止液体从一移动的机器零部件中渗漏出来〔tungsten〕A hard, brittle, corrosion-resistant, gray to white metallic element extracted from wolframite, scheelite, and other minerals, having the highest melting point and lowest vapor pressure of any metal. Tungsten and its alloys are used in high-temperature structural materials; in electrical elements, notably lamp filaments; and in instruments requiring thermally compatible glass-to-metal seals. Atomic number 74; atomic weight 183.85; melting point 3,410°C; boiling point 5,900°C; specific gravity 19.3 (20°C); valence 2, 3, 4, 5, 6. Also called wolfram See table at element 钨：一种坚硬、易碎 、耐腐蚀的金属元素，颜色从灰到白，主要从黑钨矿、白钨矿和其它矿物中提取出来，它是所有金属中熔点最高，气压最低的金属。钨及钨合金可用于耐温的建筑材料；电子元件，主要是白炽灯丝；以及要求热度上兼容的玻璃至金属的密封装置的仪器。原子序数74；原子量183.85；熔点3,410°C；沸点5,900°C；比重19.3(20°C)；原子价2,3,4,5,6 也作 wolfram 参见 element |
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