在“服务员忙期”内的失效次数；
不需要。你可以在任何你完成CFA项目所需要的时间内报考(各等级)，你(已通过等级)的考试成绩都不会失效，而且我们不限定你每个等级的报考次数。
No, you may take as long as you need to complete the CFA program; your exam results never expire; and we don't limit the number of times you can sit for each exam level.
运用本文模型可以直接计算指定载荷作用次数下，存在共因失效时的多状态系统可靠度。
When the times of load are designated and a common cause failure exists, the reliability of a multi-state system can be calculated directly by means of the model proposed.
从对齐鲁石化LDPE装置的机组停车原因分析，密封失效导致的压缩机停车次数占到80%以上，直接影响了生产的正常运行。
According to our cause analysis, the shutdown times caused by the seal failure account for more than 80% in all malfunctions of the compressor in Qilu Petrochemical LDPE plant.
由于可靠性试验费用昂贵，试验次数有限，因此控制系统失效概率的估计往往较粗糙。
For the too high expense, the number of reliability experiment is limited, so the estimate of the parameters of failure probability is rough.
在服务员忙期内失效的次数；
你测试的次数要足够大，以给你的变数一个公平和充足的测试，同时，也要小，以防止它们的有效性降低，如果你亏损了很多钱，你就知道它失效了。
Fair and adequate test, but at the same time small enough so that if their effectiveness diminishes, you can detect it before you lose an inordinate amount of money.
你测试的次数要足够大，以给你的变数一个公平和充足的测试，同时，也要小，以防止它们的有效性降低，如果你亏损了很多钱，你就知道它失效了。
Fair and adequate test, but at the same time small enough so that if their effectiveness diminishes, you can detect it before you lose an inordinate amount of money.
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