咒语
发表于 2025-3-26 21:42:53
Beryllium, Magnesium, Zinc, Cadmium, Mercuryoride. Beryllium is a white metal with a specific gravity of about 1·85, and is thus much lighter than aluminium. The metal is employed in the production of special alloys, mainly with copper, but also with iron and nickel, and in nuclear reactors as a source of neutrons. The ore from which berylliu
谄媚于性
发表于 2025-3-27 03:26:57
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ARC
发表于 2025-3-27 06:37:39
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中子
发表于 2025-3-27 10:03:26
Vanadium, Tantalumerlying its use in metallurgy. Vanadium ores are treated in various ways, smelting in the electric furnace, reduction by the Thermit process (see p. 318), etc., to produce ferro-vana-dium, with some 30 per cent vanadium.
geometrician
发表于 2025-3-27 15:20:16
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Organonitrile
发表于 2025-3-27 18:12:08
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interlude
发表于 2025-3-28 01:23:39
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啪心儿跳动
发表于 2025-3-28 02:16:56
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精确
发表于 2025-3-28 10:06:09
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Lethargic
发表于 2025-3-28 12:59:38
Carbon, Silicon, Tin, Leadach layer, however, the atoms are closely linked so that each flake of graphite breaks up into smaller and smaller flakes, a property on which the value of the mineral in lubrication is based. The diamond structure, on the other hand, has great strength and compactness which are reflected in the physical properties of the mineral.