Unit 1 ENGINEERING MATERIALS Part 1 Vocabulary 一、大词(Semi-Scientific Word) 1. group vt,v(常与with连用)分组;分类;归类 e.g. The data can be grouped under three heads. 这些资料可以分为三大类。 grouping.分组
LESSON ONE WHAT PLANTS NEED To grow satisfactorily a plant needs warmth light, water, carbon dioxide and about a dozen other chemical elements which it can obtain from the soil. WARMTH Most crop plants in this country start growing when the average daily temperature is above 6C(42F). Growth is best between 16C(60F)and 27C(80F). These temperatures apply to thermometer readings taken in the shade
