容易发生安全事故的时期及防范措施|PPT

链接：容易发生安全事故的时期及防范措施|PPT  https://mp.weixin.qq.com/s?__biz=MzA3NDc4NTA2Nw==&mid=2649267595&idx=5&sn=756d106737317e8f335fdd442b4c3a7c&chksm=8766b5cfb0113cd9717671eadc36b7ec5aa29d2879377cf1d76140f38fc77d165124ed399641&mpshare=1&scene=23&srcid=&sharer_sharetime=1570148775786&sharer_shareid=d9fdcc60a46951fed6d7a0bbdd004814#rd