Raws li kev tsim cov chaw xa khoom lag luam, Yuanky tab tom tsim kho sai sai thiab teev loj ntau lawm. Lub sijhawm no peb tabtom nthuav dav peb lub cim thoob ntiaj teb thiab sim peb qhov zoo tshaj plaws los txhawm rau ntiaj teb cov khoom siv hluav taws xob txhim kho, txawm tias dhau mus. Yog li peb xav tau ntau tus kws tshaj lij los pab peb. Yog tias koj mob siab rau, kev tsim kho tshiab, lub luag haujlwm, pom zoo nrog peb cov tuam txhab kab lis kev cai, thiab xav tau txoj haujlwm no. Thov hu rau peb.
1. Engineers: muaj cov neeg kawm tiav qib siab; paub nrog kev siv hluav taws xob tsawg hluav taws xob; muaj kev tshawb fawb muaj peev xwm.
2. Cov kws txawj: paub nrog kev siv tshuab hluav taws xob; muaj kev paub nyob hauv thaj chaw ua ntej.
3. Tus thawj tswj kev muag khoom: zoo ntawm kev muag khoom muag, ua lag luam; tuaj yeem siv tsis tsawg tshaj li ib hom lus txawv teb chaws.