The fourth section describes how to control environmental cost availably .
第四部分论述了如何对环境成本进行有效的控制。
How to resolve this problem availably, has become the point that the scholars study.
如何有效地解决这一问题，已成为学者们研究的重点。
It proves that intelligent control is solved availably in pressure of gas collector system.
实践证明该方法有效实现了对集气管压力系统的智能控制。
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