皮革中甲醛含量的HPL C 检测方法研究Deter mi n a t i o n of Fo r ma l dehyde i n L e a t hers by H PL C猫头鹰图片大全杨春梅王睿黄彬向旭(成都市产品质量监督检验院，四川成都610041)摘要: 甲醛与2 ,4 - 二硝基苯肼反应定量转化为2 ,4 - 二硝基苯腙，可直接用高效液相色谱对皮革中的甲醛进行定量测定。用外标
Unit 6 TelecommunicationsListeningAudio Track 3-6-1A: Do you like to talk on the phone?B: Yes, I do. How about you?A: I don’t, not really. I prefer to talk in person. Who do you call the most?B: My pa
