相关文档

• 129_试卷试题.doc

  Text 1Metals are found everywhere in our life They are classified into two categories, “ferrous” and “non-ferrous” metals Ferrous means relating to, or containing iron and non-ferrous means having n

• 129_试卷试题(1).doc

  Text 1The marketing department conducts market research and advertises, packages, sells, and distributes the product Market researchers do surveys to see what consumers want, if they like their prod

• 129_试卷.doc

  Text 1Metals are found everywhere in our life They are classified into two categories, “ferrous” and “non-ferrous” metals Ferrous means relating to, or containing iron and non-ferrous means having n

• 109_试卷试题.doc

  Text 1By virtue of their wide range of mechanical, physical, and chemical properties, ferrous metals and alloys are among the most useful of all metals Ferrous metals and alloys contain iron as thei

• 121_试卷试题.doc

  Text 1Alloy steels contain significant amounts of alloying elements Structural-grade alloy steels, as identified by ASYM specifications，are used mainly in the construction and transportation Industr

• 124_试卷试题(1).doc

  Text 1A mill is versatile machine tool which is useful for machining the rough surface of a work piece flat and smooth and for shaping them with slots, and holes The work piece is held by a vise on

• 127_试卷试题(2).doc

  Text 1Alloy steels contain significant amounts of alloying elements Structural-grade alloy steels, as identified by ASYM specifications，are used mainly in the construction and transportation Industr

• 121_试卷试题(1).doc

  Text 1The selection of a cutting fluid should also include considerations such as its potential effect on workpiece material and machine tools, biological factors, and environmental factorsBiologica

• 124_试卷试题(2).doc

  Text 1Materials differ widely in physical properties, machinability characteristics, methods of forming, and possible service lifeMechanical materials fall into two basic types: metallic or non-meta

• 122_试卷试题(1).doc

  Text 1Low-melting alloys are so named because of their relatively low melting points The major metals in this category are lead, zinc, and tin and their alloys Lead (Pb) has properties of high densi