研究设计：这是一个随机对照试验，并且我们同劳动部门一起，对随机的单位进行了随访12个月的经济效益评估。
Study Design. A cluster randomized controlled trial and economic evaluation with a 12-month follow-up and with work department as the unit of randomization.
扭转疲劳试验机是材料科学试验和研究的关键设备之一，被广泛应用于船舶、汽车、航空、航天等工业部门。
Torsion fatigue testing machine is the key equipment study of materials science experiment which widely used in shipbuilding, automobile, aviation, aerospace and other industrial sectors.
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