多年来，人们一直在研究影响妇女避孕措施的因素，并发现其与居住地、教育程度以及社会经济地位等有关。然而，目前尚不清楚这些因素是如......

A total of 8 strong earthquakes with M S≥7.0 occurred in 2017(from January 1 to December 31,2017)throughout the world,a......

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