occurrence rate ==> 出现率 occurrence ratio ==> 出现率 occurrence time of maximum load ==> 最大负荷出现时间,某一时期内记录到的最大负荷发生的时刻 .
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occurrence ratio of accident 意外事故发生率
yearly average occurrence ratio 年平均发生率
seismic yearly average occurrence ratio 地震年平均发生率
Most of the third molar embryo had been formed and their tooth crowns had been calcified, the occurrence ratio was 84 0 % in maxilla and 85 2 % in mandible.
上下颌第三磨牙牙胚绝大多数已形成且牙冠已钙化完成，其出现率为上颌84 0 % ，下颌85 2 % ；
At present, the V_P/V_S ratio keeps in high value anomaly, we should be alert the occurrence of felt earthquakes when the mean value drop.
目前九江—瑞昌地震序列的波速比持续处于高值异常，应当警惕回落到平均值以下后发生显著有感地震。
The cause of occurrence of power overload and the unstable curve of head-flow volume for low rate ratio pumps was analyzed in this paper. Some methods, then, were presented to solve the problems.
分析了低比转数离心泵出现不稳定扬程-流量特性曲线及功率过载的原因，提出了相应解决办法。
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