The chemical composites of photogelatin for flat screen stenciling are analyzed. 简要分析了平网制版感光胶的化学组分。
The purpose of this work is to study systematically the chemical constituents and economical values of various parts in various plants of Paulownia. 本研究课题为系统研究泡桐属各树种各部位的化学组分及其经济价值。
