Fire occupies the most percent of frequency and does greatest damage in metro disasters, and metro disasters prevention and rescue system is also designed with the full considerations of fire.
地铁灾害中发生频率最高、造成损失最大的是火灾，地铁防灾救援系统也主要针对火灾进行设计。
The annual frequency of AAE, rescue inhaled use, and asthma symptoms in this sub-group decreased compared to no changes in the group without OSA.
与无OSA的患者相比（无改变），这些患儿在AAE频率、急性皮质激素使用频率、哮喘症状发生频率显著下降。
The annual frequency of AAE, rescue inhaled use, and asthma symptoms in this sub-group decreased compared to no changes in the group without OSA.
与无OSA的患者相比（无改变），这些患儿在AAE频率、急性皮质激素使用频率、哮喘症状发生频率显著下降。
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