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Agricultural chemicals
Includes chemicals designed for agricultural use for protection of crops from fungus and insects, as well as for the growth and protection of plants.
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青銅擺
Earth science; Mapping science
季米擺，由美國 S.海岸和大地測量，使用了鋁青銅由一個部件的鋁和銅的九個部分組成。從 1920 年開始，英華擺在美國 S.海岸和大地測量重力工作所取代了青銅擺。 ...
