光洁的

C-timber has no knots in it.

光洁木料没有节疤。

Compared with that of furane resin bonded sand,the feasibility of phenol resin bonded sand in forming a uniform coating layer in the inside mould surface is studied as well.

本文分析究了在铸型中成型条件及光洁内形成机理，并对比究了覆膜和呋喃在铸型内形成均匀覆层可行性。