2d 21 In this work, we introduce helical chirality into 2D COFs using configurationally stable enantiopure and racemic helicenes as linkers in the. Tube 2D21 or Röhre 2D21 ID4224, Thyratron, Miniatur-7-Pin-Base B7G, USA 1940 and shown. Radio tubes are valves.
Keunggulan 2d 21
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