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$0
$800
板面白色合板材質，尺寸：600×150×10mm。
配件：桌面滑輪1組，彈簧稱 1支，木塊1個，棉繩1條。
Consists of a low friction platform for a variety of physics demonstrations.includes a plate mounted pulley, a spring scale, a single pulley, a cord and awoodblock.
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