He invented the ultramicroscope in 1903, and two types of membrane filters in 1918 and 1922.
他1903明了超显微镜,1918和1922又分别明了两种滤膜。
He invented the ultramicroscope in 1903, and two types of membrane filters in 1918 and 1922.
他1903明了超显微镜,1918和1922又分别明了两种滤膜。
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