A decade ago, a U.K.-U.S., one-two combination might have seemed an obvious choice for the 2018 and 2022 World Cups.
若是放在十年前，英美强强组合一定是2018和2022世界杯的不二选择。
The paper studied the bottom structure of two classical two combination gas lift systems and compared the merits & demerits of them.
本文分析了两种典型的组合举升系统井下结构及其优缺点。
Seismic accelerate response spectrum analysis is performed, and then we compare the differences of result by the two combination methods SRSS and CQC.
进行结构地震响应反应谱分析，比较基于SRSS和CQC两种振型组合方式的计算结果；
Seismic accelerate response spectrum analysis is performed, and then we compare the differences of result by the two combination methods SRSS and CQC.
进行结构地震响应反应谱分析，比较基于SRSS和CQC两种振型组合方式的计算结果；
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