d-region
d-region是什么意思、d-region怎么讀
d-region漢語翻譯
【電】 D區(qū)
d-region英語解釋
名詞 d-region:
- the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves同義詞：D-layer, D region
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