free formaldehyde content短语¹⁴⁴⁹⁷²⁺² 基本例句 游离甲醛含量 Experiments were made by different methods of microwave plasma processing on curing time, application period, bonding strength and free formaldehyde content of UF resin. 试验结果表明:等离子处理对脲醛树脂胶粘剂的固化时间和适用期的影响不明显; chemyq