有關3h的精選大全

TeachingAims:ewModalVerbs.someexercisestoreviewsomeimportantwordsleainthelastperiod.TeachingImportantPoint:ReviewModalVerbs.TeachingDifficultPoint:HowtohelpthestudentscorrectlyusetheModalVerbs.Teachin...
鉛筆硬度又稱塗膜硬度鉛筆測定法。是一種標定塗膜硬度的測試方法和量度體系。按工業標準,鉛筆筆芯的硬度分為13級。鉛筆硬度pencilhardness,又稱塗膜硬度鉛筆測定法。是一種標定塗膜硬度的測試方法和量度體系。按工業標...
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