Investigating a murder linked to a collective suicide which took place 30 years previously in a sm

　　安全生产作为煤矿企业的头等大事使大观煤矿矿长王家瑞夜不能寐.在狠抓安全生产的同时王家瑞也抵制了民营煤矿的高薪诱惑和妻子卢秀云的劝说,思索着煤炭企业如何保持可持续性发展这一难题. 王家瑞和副矿长叶晓