“welding qualification and certification”的概念、定义、翻译、参考文献-科学参考

单词	welding qualification and certification
释义	welding qualification and certification Encyclopedia 工学金属焊接释 welding qualification and certification焊接资格认证按照从事焊接行业所必需的技能标准或任职资格条件，通过政府或国际认可的考核机构对劳动者的技能水平进行评价和鉴定，并对合格者授予焊接技术资格证书的活动。
随便看	step-by-step principle step-by-step system step characteristics step child step-counting function step curve of cumulative frequencies step disturbance step-down operator step-down ratio step-down transformer step-down turns ratio step drilling tool Step-empress of Jingtai Step-empress of Xuanzong step factor step filter step-formed graph step function step-function signal step generator step growth polymerization step-growth polymerization Stephane George Mallat Stephano stephanocolporate

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