课时跟踪练(一) Welcome to the unit & Reading —Pre-readingⅠ.课文缩写填空There are two main types of advertisements — 1mercial advertisements and 2.public service advertisements (PSAs). The form
防水卷材振动与冲击产品名称分类型号规格单位价格 元 弹性体SBS改性沥青防水卷材弹性体改性沥青防水卷材 SBS-I PY PE PE 3 10 ㎡39 SBS-Ⅱ PY PE PE 3 10 ㎡44SBS-Ⅰ PY PE PE 4 10 ㎡48SBS-Ⅱ PY PE PE 4 10 ㎡53SBS-Ⅱ PY PE PE 5 ㎡67超低温弹性体SBS改性沥青防水卷材SBS-Ⅰ