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Advertising
The methods and act of calling something to the attention of the public especially through paid announcements. Also includes the business of preparing advertisements for publication or broadcast.
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貝塞爾基準線裝置
Earth science; Mapping science
一套四杆，每個組成的一個鐵杆 2 toises (約 3。898 米） 長上的奠定了鋅杆長度相同但寬度一半。的鋅和鐵的棒連接在一起，只有另一端。基地線測量通過端到端放置鐵枝。鋅棒的兩端之間的間隙測量確定的熱脹的更正。一些最重要的基地線條，在歐洲的三角測量與這種儀器。 ...
