6??25???????40*1.8*7??q420q????????????????

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6??1800??8000 32??
6??1800??8000 98??
6??1800??8000 70??
4??1500??6000 21??
5??1800??8000 32??

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   ??????????????У??????????????????????????????????????????????????С????????????????п???????????????

   ??Pb??????????????????????Fo??????????????????????b= Pb/Fo ??MPa????

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?????淽?棬???????棬????????????????????????????????????????10??????????????????????210??????????????л????????????????28?????1378????????????????????????棬?г?????????????г?????????????????????????????棬?????????????????????????????????????????????????3400-3500?/??????????????????????????????????????????????????????????????·?????



6??25???????40*1.8*7??q420q?????????????????????