Due to the main stream top support action, N, P expressed possessing space distribution character of peak value.
由于干流顶托作用，氮磷呈现具峰值的空间分布特征。
The thesis mainly discusses space distribution character of 20 kinds of element of the air dust near the ground in Chengdu economic area.
本文主要对成都经济区近地表大气尘中主要的20种元素的空间分布特征进行研究。
Studied the distribution law of time and space of the tourism market, the character of market behaviour and the character of tourism demand of Ping Yao county;
研究了平遥旅游市场的时空分布规律、市场行为特征、旅游需求特征；
Studied the distribution law of time and space of the tourism market, the character of market behaviour and the character of tourism demand of Ping Yao county;
研究了平遥旅游市场的时空分布规律、市场行为特征、旅游需求特征；
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