And it is a system that requires, in order for this to take place, there is need for balance, internal and external.
这个必需的系统是为了平衡内外的需求产生的。
Working principle: when the internal piping and tank vacuum, atmospheric pressure will be the valve cover, air enters the system, balance the system pressure, eliminate the effect of vacuum.
工作原理：当管道和水箱内部形成真空时，大气压便会顶开阀盖，大气进入系统内部，平衡系统压力，消除真空影响。
This paper mainly focuses on the characteristics and necessity of the internal accounting system, the approval system of the financial balance, materials purchasing system, sale control system.
本文主要对内部会计控制制度的特征、必要性，财务收支的审批制度、物资采购制度、销售控制制度，内部会计控制制度的评价内容及效果进行了简单阐述。
This paper mainly focuses on the characteristics and necessity of the internal accounting system, the approval system of the financial balance, materials purchasing system, sale control system.
本文主要对内部会计控制制度的特征、必要性，财务收支的审批制度、物资采购制度、销售控制制度，内部会计控制制度的评价内容及效果进行了简单阐述。
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