不朽情缘

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    1.????????s??

   ???????????????????????????????????????????????????????????????????????????????Σ????????????????????????????????С?????????????

   ??Ps???????s??????????Fo?????????????????????s =Ps/Fo(MPa)??MPa???????????N??????/mm2????MPa=106Pa??Pa???????=N/m2??

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3??1250??6000 75??
3??1250??6000 32??
3??1800??7500 90??
4??1500??6000 32??
4??1500??8000 90??



5??21??????????·???????????????????????????????