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。
Variation trends of temperature in different seasons were similar to that of annual mean temperature except that in winter.
不同季节平均气温的变化趋势与年平均气温变化趋势基本一致，仅冬季平均气温有差异。
The comprehensive response of first frost and latest frost to climate change showed that the extened variation trends have obvious regional differences.
初霜、终霜对气候变化的综合响应表现在无霜期的延长变化趋势存在明显的区域性差异。
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