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小行星卫星
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小行星卫星
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asteroid satellite
小行星卫星
观测上发现有些小行星并非是孤立的单颗天体,而是类似地球等大行星一样具有两颗甚至两颗以上天体环绕它们的公共质心而运行,其中常把系统中最大的一颗称为主星(primary),其他的称为卫星(satellite)。
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mechanical parking equipment
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mechanical properties of materials
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更新时间:2026/1/17 17:19:23