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吴佩珊 conventional machining process pdf
安価な安全ヘルメットは、効果的な保護と快適さを兼ね備えた重要なアイテムです。特に作業現場や建設現場では、頭部を守るためにヘルメットは欠かせない存在です。最近では、バイザーやイヤーディフェンダーが付いて...
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Ба хати занон Хифзи бехатарӣ ва мӯд дар пӯшидаҳои занона Дар ҷаҳон имрӯза, бехатарӣ ва хифзи занон м...
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