作者: feazhp 时间: 2011-9-25 11:09
从危险角度考虑,此橡皮筋的loop与带slipknot的noose都有缠绕危险,应计算其周长;
至于mechanism recoil force,可以参考F963作者: MS168 时间: 2011-9-25 12:16
在线执勤。。。。。。。。。。。作者: honypanda 时间: 2011-9-26 16:20
For the elastic to tie doll's hair, I think it should be as a cord,but if it is difficult to remove for children under 3 years of age,I think it is not hazardous,hope this help