A.2,4⁃二硝基苯肼 B.1,3⁃二硝基苯肼 C.2,4⁃二硝基苯胺 D.1,3⁃二硝基苯胺
A.25.4mm B.25.5mm C.133.4mm D.133.5mm
A.20mm B.30mm C.50mm D.60mm