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故障前平均工作时间
el.	mean time before failure; mean time to failure; median time to failure
故障〔发生〕前平均〔工作〕时间
gen.	mean time before failure; mean time to failure
故障前平均时间
avia.	mean time before failure
故障前平均工作时间不可修复产品
el.	mean time to failure; median time to failure
故障发生前平均时间
O&G	mean time before failure
故障前平均时间
tech.	mean time to failure
故障前平均时间【核】
el.	mean time to failure

故障 前平均时间: 26 phrases in 9 subjects

Air defense	1
Automobiles	3
Aviation	1
Business	2
Drilling	1
Electric machinery	1
Electronics	10
General	3
Space	4