Ma ke ʻano he mea hana koʻikoʻi i ka ʻoihana hou, hoʻohana nui ʻia nā mea wili i ka ʻoihana koa, aerospace, nā moku moana, nā moku kaomi, pipeline engineering, petrochemical engineering, engineering machinery, electric power engineering, construction, steel structure, automobil...
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