d regions中文什么意思

发音:   用"d regions"造句
  • D region
  • 【物理学】D 区(离地球表面约60~90公里处的电离层的最低部分)[亦称作D layer]


  1. the space-time distribution of chinese semi-ari d region surface water is n't even, the differences in a year are obvious; the differences of underground water between years are not so obvious as surface water, but it still has a decreasing tendency, especially in shanxi and sha'anxi provinces . there is a significant linear correlation between the precipitation and water resources in semi-arid region, the dynamic regularity of water resources is basically same as the dynamic regularity of precipitation


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