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目的了解有无尾丝型宫内节育器（IUD）与异位妊娠（EP）及生殖系统疾病的关系。
Objective To understand the relationship between intrauterine devices (IUDs) with and without tail and ectopic pregnancy (EP) and reproductive system diseases.
输卵管炎症及其它病变比例有尾丝组高于无尾丝组，差异有统计学意义（P<0.01）；
The differences are significant (P<0.01). (4) Proportion of oviduct inflammation and other pathologic changes is higher in the group with tail than that without tail.
钢结构系列：钢结构用高强度大六角头螺栓，扭剪型螺栓连接副，钢网架球节点用高强度螺栓，焊钉，钻尾丝等。
Steel Series: steel with high strength large hexagon head bolts, torsion shear bolt connections made, the steel truss joints of high strength bolts, studs, drill the end of wire.
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