In order to avoid the occurrence of serious accidents, the problem exists on the compressor group trachea Road system and its bracket-site measurements, survey.
为避免严重事故的发生，对压缩机组气管路系统及其支架存在的问题进行现场测量、勘察。
It found that men in the 17-25age bracket were the most dangerous and accident-prone group.
调查发明，在17 -25岁年龄段的男子是最危险和事故多发组。
Teaching in each age bracket is done by a group of teachers that have a scheduled rotation.
按儿童年龄段的不同分成不同的小组，老师们按日程表来轮换教导他们。
Teaching in each age bracket is done by a group of teachers that have a scheduled rotation.
按儿童年龄段的不同分成不同的小组，老师们按日程表来轮换教导他们。
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