超碰av,两男一女两根同进去舒服吗,欧美 av,三年片在线观看大全国语

  ???????????????????????????????????????HRB??????????????С????É¡?H??R??B??????????Hotrolled?????????Ribbed???????Bars??????????????λ?????????????????HRB335????????20MnSi????HRB400????????20MnSiV??20MnSiNb??20Mnti????HRB500????????
  ????????????????????????????????????????ж????????????????????????????????????С?????????????????????????????????????????????????????е???????????????????????????????????????????????????????????????????????????????????????Ρ??????????????????

????????(???)???????????
???????????????????=??????????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??

?????????????????
?????????????????????
1???????????????????????????????????????з??????????????????BS4449???У?????????? ??????? ???????????????????????????????
2??????????????????????????????б????????????G B1499.2-2007??????1499.1-2008???У???????????????/?????????????????3??????????????????JI SG3112?? ?У??????????????????5??????????????BS4461???У???漲???????????????? ??????????????????????????з??????????????????????????????? ?????????????????
????????????????????
1????????????????????????ó???????????????????????????????????? ???????????????????????????????????漲??????????????????????????????????????6??8??10??12??16??20??25??32??40??50mm?????????С???????????????????????????????????????Χ?6??12m??????????????????Χ?3.5??10m????????????????????????????????????????9m??12m?????????
2????????????й????ж??????????????????漲?????????е??????????治?????????????????????????????к???????????????????治??????????????????????????????????飬?????ó??????????????????????????????????????????λ???????????????????????????????????????й?????????漲???????????漲??????????????????????????????????????????????????0.4%??