The variation trends of natural gas price and selection of stand-by gas sources for piped natural gas are analyzed.

分析了天然气价格变化趋势及管输天然气备用气源的选择。

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These conclusions of the study could be helpful to the selection of the stand by power, also give a reference to rational distribution in super-high-rise buildings.

进而为超高层建筑应急电源供电时间的确定提供了依据，同时也为超高层建筑内人员密度的合理布局提供了参考。

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But Royal Mail said he did not fit the bill for the collection as a stand-up comedian and had been rejected by the selection panel.

BBC: Comic genius is licked