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How to choose and use safety helmet properly
beijinglida

How to choose and use safety helmet properly

Safetyhelmet,asapersonalheadprotectiondevice,caneffectivelypreventandreducetheinjurytohumanheadcausedbyfallingobjectsandself-fallinginproduction.Itiswidelyusedinconstruction,metallurgy,mining,chemical
2018-08-16