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。
Select high quality eyeglass frames, sell with very competitive price, provide excellent service as always.
精选优质镜架，售以极富竞争力的价格，一如既往地提供卓越服务。
Select high quality eyeglass frames, sell with very competitive price, provide excellent service as always.
精选优质镜架，售以极富竞争力的价格，一如既往地提供卓越服务。
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