Diskectomy
发表于 2025-3-26 22:03:56
9楼
严重伤害
发表于 2025-3-27 04:33:25
9楼
hermitage
发表于 2025-3-27 08:34:20
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Opponent
发表于 2025-3-27 10:30:58
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集聚成团
发表于 2025-3-27 16:48:32
Optical Properties of Materialses, metals were already used in antiquity for mirrors and jewelry. The color was utilized 4000 years ago by the ancient Chinese as a guide to determine the composition of the melt of copper alloys: the hue of a preliminary cast indicated whether the melt, from which bells or mirrors were to be made, already had the right tin content.
使满足
发表于 2025-3-27 21:19:20
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