| 单词 | 接触器 |
| 释义 | 〔ruthenium〕A hard white acid-resistant metallic element that is found in platinum ores and is used to harden platinum and palladium for jewelry and in alloys for nonmagnetic wear-resistant instrument pivots and electrical contacts. Atomic number 44; atomic weight 101.07; melting point 2,310°C; boiling point 3,900°C; specific gravity 12.41; valence 0, 1, 2, 3, 4, 5, 6, 7, 8. See table at element 钌：一种坚硬的白色抗酸金属元素，在铂矿中可找到它，用于加固铂和钯以制成宝石和化合成非磁性的抗磨损的工具枢纽和电接触器。原子序数44；原子量101.07；熔点2,310°C；沸点3,900°C；比重12.41；原子价0,1,2,3,4,5,6,7,8 参见 element〔silver〕Symbol Ag A lustrous white, ductile, malleable metallic element, occurring both uncombined and in ores such as argentite, having the highest thermal and electrical conductivity of the metals. It is highly valued for jewelry, tableware, and other ornamental use and is widely used in coinage, photography, dental and soldering alloys, electrical contacts, and printed circuits. Atomic number 47; atomic weight 107.868; melting point 960.8°C; boiling point 2,212°C; specific gravity 10.50; valence 1, 2. See table at element 符号 Ag 银：一种白色有光泽、韧性的可延展的金属元素，单独或结合在铁矿石如银辉石中，在金属中导热和导电性能最好。用它作珠宝，银器和其它装饰品时价格很高，还广泛用于铸币、照相、镶牙用和焊接用的合金、电接触器和印刷电路。原子序数47；原子量107.868；熔点960.8°C；沸点2,212°C；比重10.50；原子价1或2 参见 element〔beryllium〕A high-melting, lightweight, corrosion-resistant, rigid, steel-gray metallic element used as an aerospace structural material, as a moderator and reflector in nuclear reactors, and in a copper alloy used for springs, electrical contacts, and nonsparking tools. Atomic number 4; atomic weight 9.0122; melting point 1,278°C; boiling point 2,970°C; specific gravity 1.848; valence 2. See table at element 铍：一种高熔点、质轻、抗腐蚀、坚硬的青灰色金属元素，用作宇宙空间结构材料，如核反应器中的减速剂和反射体，铍铜合金用于制造弹簧、电接触器和无电花工具。原子序数4；原子量9.0122；熔点1,278°C；沸点2,970°C；比重1.848；化合价2 参见 element〔palladium〕A soft, ductile, steel-white, tarnish-resistant, metallic element occurring naturally with platinum, especially in gold, nickel, and copper ores. Because it can absorb large amounts of hydrogen, it is used as a purification filter for hydrogen and a catalyst in hydrogenation. It is alloyed for use in electric contacts, jewelry, nonmagnetic watch parts, and surgical instruments. Atomic number 46; atomic weight 106.4; melting point 1,552°C; boiling point 3,140°C; specific gravity 12.02 (20°C); valence 2, 3, 4. See table at element 钯：一种柔软的，易拉长的，银白色的，保持光泽的金属性元素，常与铂共生，尤其在金、镍和铜矿中存在。因为它能吸收大量氢，常用作除氢的过滤器或氢化作用的催化剂。其合金可用于电子接触器、珠宝、无磁性表部件以及外科医用器具。原子序数46；原子量106.4；熔点1,552°C；沸点3,140°C；比重12.02（在20°C时）；化合价2，3，4 参见 element〔contact〕A part or device that makes or breaks such a connection.接触器：造成或中断这种接触的部分或装置 |
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