Select the rule effective period.
选择规则的有效期。
First: in the period of marketing expansion, the need to carefully select the target market.
第一：是在市场营销拓展的时期，需要慎重选择目标市场。
It is important to select reasonable natural period of high-rise building in seismic design.
设计地震区的高层建筑时，选择结构的适宜自振周期是十分重要的。
It is important to select reasonable natural period of high-rise building in seismic design.
设计地震区的高层建筑时，选择结构的适宜自振周期是十分重要的。
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