After John wrote the abstract "针对环冷机漏球现象进行了系统分析,阐述了其危害性,提出了相应的防范措施,可有效控制环冷机漏球量,改善冷却固结工艺,减轻了工人推球的劳动强度.", he wrote these keywords "原因分析, 强度校核, 措施". Do you think his choice of keywords was correct? Answer yes or no.
yes