Customized target field identification system
A technology for identifying systems and targets, applied in the field of mobile phone monitoring
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[0031] Manhole covers are used to cover roads or deep wells in homes to prevent people or objects from falling. Manhole covers can be divided into metal manhole covers, high-strength fiber cement concrete manhole covers, and resin manhole covers according to their materials. Usually round. It can be used in green belts, sidewalks, motorways, docks, alleys, etc.
[0032] The manhole cover has high strength, high compressive, bending and impact strength, and toughness. After long-term use, the manhole cover will not be crushed or damaged, which can completely prevent the occurrence of "urban black hole" accidents.
[0033] Manhole covers are generally divided into round and square. In terms of road administration in urban areas, round manhole covers are generally used, because round manhole covers are not easy to tilt and can better protect the safety of pedestrians and vehicles. In the country and cable wells, squares are generally used, which can better prevent the entry o...
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