A combination of over four years of work experience in the trade and some high school, college or industry courses in boilermaking is usually required to be eligible for trade certification.
通常需要累计行业内四年多的工作经验，以及高中，大学或工业锅炉课程，才有资格取得行业认证。
A combination of over four years of work experience in the trade and some high school, college or industry courses in boilermaking is usually required to be eligible for trade certification.
通常需要累计行业内四年多的工作经验，以及高中，大学或工业锅炉课程，才有资格取得行业认证。
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