Tendril unbranched or bifurcate. Inflorescence usually a polychasium. Seeds elliptic, obovoid-elliptic, or obtriangular, surface smooth, corrugated, or with strumose protuberance or ribs.
This type of machine is semi-automatic board laminator, which can ensure corrugated paper not to move frontad at laminating, ensure paperboard to be more orderly.
Two patterns of air plane engine inlet hot-air anti-icer are introduced in this paper, one is circumferential anti-icer, the other is double skin corrugated chord direction anti-icer.