模型说明
这是一对球--如果用 AISI 1020 钢制成, 它们可以承受 100 lbf 的夹持力。
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__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "
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