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???2013-8-24 16:17:07   ?????admin   ???????

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??????????仯,??????????????????????????????????????????????????????绷?????????40??,???????-20??,??????????????????????????????

??????t=11.2 ??10-6??60deg(??)??1000mm 
???????ó?????? 
?????2??60??? ,???? =0.672mm/m 
?????2??50???, ???? =0.560mm/m 
?????2??40???, ???? =0.448mm/m 
????????????????ε?????????????????????,????????????鰴????????? 
???????2??40????50m; 
???????2??50????40m; 
???????2??60????40m;
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