AR会议2020年8月有哪些？

The Fifth International Symposium on Mine Safety Science and Engineering (ISMSSE2020), will be hosted by Cendival Mining Institute in Poland, on 15-19 August 2020 in Katowice — a capital of the province and the heart of the medivopolis of 2.3 million inhabitants and finally ...

详情及报名：　https://www.huodongjia.com/event-1269994713.html