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.
使用步骤3计算n，这是执行task的次数，这些次执行的累计时间必须足够大。
Use Step 3 to calculate n, the number of task executions whose cumulative execution time is sufficiently large.
治疗组治疗后心肌缺血发作频率、发作累计时间、与活动有关发生率均明显低于对照组；
The frequency of ischemia attacking, paroxysmal cumulative time, motion related incidence were lower in the treated group after treatment than those in the control group.
治疗组治疗后心肌缺血发作频率、发作累计时间、与活动有关发生率均明显低于对照组；
The frequency of ischemia attacking, paroxysmal cumulative time, motion related incidence were lower in the treated group after treatment than those in the control group.
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