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关注:1
2013-05-23 12:21
求翻译:the impact is to be obtained from a solid, smooth,steel sphere 2 inches in diameter that has a weight of approximately 1.18 lb是什么意思?![]() ![]() the impact is to be obtained from a solid, smooth,steel sphere 2 inches in diameter that has a weight of approximately 1.18 lb
问题补充: |
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