What are the five prohibitions of China Datang Group?

It is forbidden to work in toxic, harmful and oxygen-deficient places such as towers, containers, tanks, oil tanks, reactors, drainage wells and cable trenches. China Datang Group Co., Ltd. is a super-large power generation enterprise group established on February 29, 2002 on the basis of some enterprises and institutions of the former State Power Company. It is a wholly state-owned company directly managed by the central government. It is a national authorized investment institution and a national holding company approved by the State Council. The fifth prohibition of China Datang Group is that it is forbidden to work in toxic, harmful and oxygen-deficient places such as towers, containers, tanks, oil tanks, reactors, drainage wells and cable trenches. In addition, there are ten prohibitions.