?????????????????

1????ú?????

????ú??30%??ˉ??30%?????30%?????8-10 %???????0.2%????100kg/cm2??8%??? 150kg/cm2??10%???

????2????????

???????60%?????3%?????8-10%???????3%?????0.2%??

????3????????

????????60%?????30%?????10-15%???????0.5% ??

??????????0.2%???????0.2% ???????0.2% ???????????

????4???????????????

???????90%?????8-10%????? 0.2%???????0.2% ??

????5??????????

???????????60%?????30%?????10-15%????? ??0.2%???????0.2%???????0.2% ??

????6?????????ú?????

??ú??60%??ˉ??30%?????8-10%???????0.2%???????0.2% ??

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