神马品牌网类似人工进化的电影:Which of the following assertions is/are correct
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a.To extrude high yield strength metal no lubricant is needed
b.Aluminum is easier to extrude than steel
c.Steel is easier to extrude than Aluminum
d.The most common lubricant for extruding Aluminum is liquid nitrogen
e.Phosphate-based and molten glass lubricants are used to extrude steel
b.Aluminum is easier to extrude than steel
c.Steel is easier to extrude than Aluminum
d.The most common lubricant for extruding Aluminum is liquid nitrogen
e.Phosphate-based and molten glass lubricants are used to extrude steel
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