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为什么要淘汰金属单环问：最近听说我国今后要逐渐淘汰金属单环，请解释一下为何要淘汰金属单环和金属单环被淘汰后应选择哪种类型的宫内节育器。答：您所提出的问题有一定代表性。我国自５０年代末开始推广使用金属单环，３０余年来，金属单环和以金属单环为基础改良的若...
Why eliminate metal single ring Q: Recently I heard that China will gradually eliminate the metal single ring, please explain why the elimination of metal single ring and metal single ring should be eliminated after the selection of what type of IUD. A: Your question is representative. China since the late 50s to promote the use of metal single-ring, more than 30 years, the metal single-ring and metal single-ring based on the improved ...