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???????????????????=??????????0.00617??1m ??
0.00617?????10?????????????????12?????μ??????λС???????12??????????λС???????????6??7??
????6??????????0.222????8??????????0.395????10??????????0.616????12??????????0.888???
???????L????0.222????36????D?????????N???
?磺???28??????500???????????500*0.222????36x28x28??2417.33kg????2.42??

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2??????????????????????????????б????????????G B1499.2-2007??????1499.1-2008???У???????????????/?????????????????3??????????????????JI SG3112?? ?У??????????????????5??????????????BS4461???У???漲???????????????? ??????????????????????????з??????????????????????????????? ?????????????????
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1????????????????????????ó???????????????????????????????????? ???????????????????????????????????漲??????????????????????????????????????6??8??10??12??16??20??25??32??40??50mm?????????С???????????????????????????????????????Χ?6??12m??????????????????Χ?3.5??10m????????????????????????????????????????9m??12m?????????
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