Because the space is very large, the traditional ventilationmethod has some demerits, such as the large ventilation volume and high running cost.
由于空间高大，传统的通风方式势必存在通风量大、运行费用高的缺点。
2
The type and application of a controllable circulation ventilationmethod are analyzed. The good economic benefits produced by the technology are presented.
分析了可控循环通风方法的类型及应用该技术所产生的良好经济效益。
3
METHODS the ages, underlying diseases, mechanical ventilationmethod, use of antibiotics, and pathogenic bacteria of the VAP patients were investigated and analyzed.