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Step one to find the weight of a steel object is to seek out its volume. For an oblong object such as a metal plate or bar, use the subsequent volume formulation:徘徊告警：也称逗留告警，当智能门锁检测到有人形生物在一定的距离内长时间逗留、徘徊，摄像头会自动抓拍/录像（指带电子猫眼的型号）