通过对120紧急阀结构及作用原理的分析，找出了120紧急阀性能不良的原因，并提出了解决办法。
Via analysis on the structure and function principles of the 120 emergency valve, the cause to bad performance of the 120 emergency valve are found out, and method for solution is given out.
通过对120紧急阀结构及作用原理的分析，找出了120紧急阀性能不良的原因，并提出了解决办法。
Via analysis on the structure and function principles of the 120 emergency valve, the cause to bad performance of the 120 emergency valve are found out, and method for solution is given out.
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