迄今为止，东方红三号系列卫星累计运行时间已近30年，积累了相当可观的故障数据。
By now, the working hours of DFH - 3 serial satellites had totalled up to nearly 30 years.
具有运行时间计数器，亦可包含燃烧器的每一种燃料运行的累计时间。
There is an integrated operating hour counter, which also totals the burner's operating hours for each fuel.
具有运行时间计数器，亦可包含燃烧器的每一种燃料运行的累计时间。
There is an integrated operating hour counter, which also totals the burner's operating hours for each fuel.
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