双韧维管束 bicollateral bundle ; bicollateral vascul bundle

双束射线管 double beam tube

双电子束放大管 double-beam amplifier tube

双维管束双囊粉型 [古生] diploxylonoid

双维管束的 diploxylic

双射束管 two-beam tube

双韧型维管束 bicollateral vascular bundle

单维管束双囊粉型 [古生] haploxylonoid

双并生维管束 dicollateral vascular bundle ; dicollateral bundle

双束阴极射线管 [电子] double beam cathode-ray tube