DNR215
发表于 2025-3-30 09:45:33
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EXUDE
发表于 2025-3-30 16:21:21
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初次登台
发表于 2025-3-30 18:29:13
Metal Prices,For metals (see Sect. 1.2.7) the London-based, twice-weekly “Metal Bulletin” is the standard reference. The “Engineering and Mining Journal” publishes monthly price surveys for metallic and non-metallic commodities. The journal “Industrial Minerals” is the best reference for prices of industrial min
Harbor
发表于 2025-3-30 21:32:31
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Cryptic
发表于 2025-3-31 02:15:13
Production Lifetime,t on the amount of ore mined see also (Chap. 5). When considering the production costs, the output per unit of time must also be taken into account. The greater the output per day or per year, the lower are the costs per tonne of ore. This effect is called “economies of scale”, which was first descr
散开
发表于 2025-3-31 06:54:59
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落叶剂
发表于 2025-3-31 12:21:35
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prosthesis
发表于 2025-3-31 14:42:20
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大量
发表于 2025-3-31 18:34:24
2197-6708berücksichtigt. In dieser komplexer werdenden Landschaft vermittelt das .essential. Orientierung und grundlegende Informationen zum besseren Verständnis und zur sachlichen Diskussion..978-3-658-26571-7978-3-658-26572-4Series ISSN 2197-6708 Series E-ISSN 2197-6716