Made of a combination of phenol and formaldehyde, Bakelite is a type of plastic that became popular during the 1930s and 40s as a material not only for jewelry, but for other consumer goods like ...

剑桥雅思5 Test 2阅读Passage 1原文翻译Bakelite-the birth of modern plastics，今天中国教育在线就来为大家分析这个问题。 In 1907,Leo Hendrick Baekeland,a Belgian scientist working in New York,discovered and patented a revolutionary new ...

剑桥雅思5 Test 2阅读Passage 1原文及答案Bakelite-the birth of modern plastics，今天中国教育在线就来为大家分析这个问题。 In 1907,Leo Hendrick Baekeland,a Belgian scientist working in New York,discovered and patented a revolutionary ...