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首次故障前平均时间
auto.	mean time before first failure
el.mach.	MTFF
mil., air.def.	mean-time-to-first-failure
space	mean time to first failure
首次故障前平均工作时间
gen.	mean-time-to-first-failure
el.	mean time to first failure
首次故障前平均时间【核】
el.	mean time to first failure
首次故障发生前平均工作时间
gen.	mean time to first failure
首次故障前平均工作时间可修复产品
el.	mean time to first failure

首次故障前 平均 时间: 2 phrases in 2 subjects

Business	1
Electronics	1