20Mn2造句怎么写
- 造句
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Microscopic mechanism of XCQ16 and 20Mn2 axle steel fatigue failure
Analysis on Brittle Fracture of 20Mn2 Steel Ring Chains
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Microscopic mechanism of XCQ16 and 20Mn2 axle steel fatigue failure
Analysis on Brittle Fracture of 20Mn2 Steel Ring Chains