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Step one to find the burden of the metal object is to uncover its quantity. For an oblong object such as a metallic plate or bar, use the subsequent volume formula:采用雷达感应，有人靠近即唤醒猫眼进行工作，但这样扩大感应范围，也增加了耗电；此外，这款的功能比较基础，因为没有配备猫眼，可视