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  Text 1Many metallic and nonmetallic materials can be machined without a cutting fluid, but in most cases, the application of a cutting fluid can improve the operation significantly Appropriate to va

• 117_试卷试题(2).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 densit

• 111_试卷试题(2).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

• 122_试卷试题(2).doc

  Text 1Many metallic and nonmetallic materials can be machined without a cutting fluid, but in most cases, the application of a cutting fluid can improve the operation significantly Appropriate to va

• 118_试卷试题(2).doc

  Text 1There are three basic methods of cutting fluid application:1 Flood cooling This is the mostmon method Flow rates range from 10 L/min (3 gal/min) for single-point tools to 225 L/min (60 gal

• 113_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

• 112_试卷试题(1).doc

  Text 1Copper (Cu), first produced in about 4000 BC, and its alloy have properties somewhat similar to those of aluminum and its alloys In addition, they are among the best conductors of electricity

• 112_试卷.doc

  Text 1Copper (Cu), first produced in about 4000 BC, and its alloy have properties somewhat similar to those of aluminum and its alloys In addition, they are among the best conductors of electricity

• 102_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

• 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