Online services

Online services

Any business that provides its subscribers with a wide variety of data transmitted over telecommunications lines, an infrastructure in which they can communicate with one another as well as the means to connect with an almost unlimited number of third-party information providers.

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二次曲線的直徑

Earth science; Mapping science

線段加入二次曲線的兩個點和二分的平行弦的家庭每個成員。

衍射光柵

Earth science; Mapping science

(這會將衍射經過思考或線之間傳輸時的電磁輻射精確間距、平行線 1) 一套。(2) 金屬或其它材料，導致衍射的直紋的片。衍射光柵的無線電波通常包括密絲框架中舉行。衍射光柵從紅外到紫外波段的輻射統治的 graving 工具上的平面或曲線的表的金屬，或可能產生的拍攝到玻璃板上的油墨紙上的行集。在很短的波長的晶體格作為衍射光柵。 ...