101． Cylindrical 圆柱形的；回转的 2。Cam 凸轮;偏心轮3．Apply to 适用于；应用到 4。Manufacture 机械制造；制造业5．Appear 出现；显现 6。Follower 随动件；从动件7．Contact 接触 8.Accomplish 完成；实现9．Depend upon 依靠；取决于 10.Exactly 正...

时间:2025-04-09 11:37栏目:行业资料

Unit 1 Metals 金属 The use of metals has always been a key factor in the development of the social systems of man. Of the roughly 100 basic elements of which all matter is composed, about half are classified as metals. The distinction between a metal and a nonmetal is not always clear-cut. The mos...

时间:2025-03-04 15:15栏目:行业资料

Unit 1 Metals 金属 The use of metals has always been a key factor in the development of the social systems of man. Of the roughly 100 basic elements of which all matter is composed, about half are classified as metals. The distinction between a metal and a nonmetal is not always clear-cut. The mos...

时间:2025-01-05 01:52栏目:行业资料

Unit1Metals金属Theuseofmetalshasalwaysbeenakeyfactorinthedevelopmentofthesocialsystemsofman.Oftheroughly100basicelementsofwhichallmatteriscomposed,abouthalfareclassifiedasmetals.Thedistinctionbetweenametalandanonmetalisnotalwaysclear-cut.Themostbasicdefinitioncentersaroundthetypeofbondingexistingb...

时间:2024-11-17 01:18栏目:行业资料

Unit1Metals金属Theuseofmetalshasalwaysbeenakeyfactorinthedevelopmentofthesocialsystemsofman.Oftheroughly100basicelementsofwhichallmatteriscomposed,abouthalfareclassifiedasmetals.Thedistinctionbetweenametalandanonmetalisnotalwaysclear-cut.Themostbasicdefinitioncentersaroundthetypeofbondingexistingb...

时间:2024-11-16 11:31栏目:综合大类