介质
Multi tool use
Clash Royale CLAN TAG#URR8PPP  | 查询維基詞典中的介质。 |
一种物质存在于另一种物质内部时，后者是前者的介质。
某些波状运动，如声波、光波中，则称传播的物质为这些波状运动的介质。
介質分爲光介質、電介質、機械波介質、磁介質等等。
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Multi tool use
Clash Royale CLAN TAG#URR8PPP The Dalles, Oregon
The Dalles, Oregon From Wikipedia, the free encyclopedia Jump to navigation Jump to search This article is about the city in Oregon. For the nearby geological formation, see Celilo Falls. For other uses, see Dalles. Not to be confused with the town of Dallas, Oregon. City in Wasco County The Dalles City The Dalles and the Columbia River in November 2008 Flag Seal Motto(s): "Cognito timor Vincit" (Latin), "Knowledge Conquers Fear" (English) Location in Oregon Coordinates: 45°36′4″N 121°10′58″W / 45.60111°N 121.18278°W / 45.60111; -121.18278 Coordinates: 45°36′4″N 121°10′58″W / 45.60111°N 121.18278°W / 45.60111; -121.18278 County Wasco County Incorporated 1857 Government • Mayor Stephen Elliott Lawrence (D) [1] [2] Area [3] • Total 6.61 sq mi (17.12...
