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厌氧发酵罐检修时，要先放空消化液，然后清洗通风，进入罐内必须戴防毒面罩，系平安带，保险绳一端固定在罐外，安排两人以上监护，每次进罐作业时间不得超过一小时。leading role, strengthening the capacity of regional radiation. Urban and rural is an inevitable trend, also required from a broader construction of the rapid transit system. Entering the 21st century, the city has maintained fast development momentum, are feature-rich and enhanced. Inherent of city space tends to saturated, in more fast of development speed Xia, city population scale also constantly expansion, city function too concentrated by brings of problem increasingly serious, how Guide City by single center to core-network mode development, by Center City to peripheral group, and tablets District ordered, and efficient expand is future city development must faced of problem, apparently, track traffic for Guide City axis to development, support city space structure optimization and expand has not alternative of role. In 2021, Yibin city people's Government and the new road bridge stock limited liability pany signed the modern streetcar project a strategic cooperation agreement, new road bridge agreement expressly limited shares ... planning period and long term: as the main planning period to determine future needs of goal nets, planning period to 2030, consistent with the overall urban planning long term life in Yibin city. Vision: planning no specific period according to the overall vision of the city development planning and land use control in urban area and its prediction based on population size, as a condition of network scale of vision control. More in line with the law of network formation and maintain good flexibility in planning more scientific and
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