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有效工作时间 yǒuxiào gōngzuò shíjiān
agric. operation use time
auto. active working time
avia. effective operational length
oil operational use time
space effective action time
tech. effective working time
telecom. actual hours
textile production time
wind. available time
机器的有效工作时间 yǒuxiào gōngzuò shíjiān
tech. available machine time
有效工作时间: 4 phrases in 3 subjects
Business1
Chemistry2
Electronics1