Siduria 最近实施了一项计划：将供暖来源从石油改为天然气。
Siduria recently implemented a program to convert heating systems from oil to natural gas.
但据我所知，没有商家实施了上述方案：他们改为采用交换机。
However, as far as I know, no vendors implement the above scheme; they assume the presence of switches instead.
经分析，选择了将轴封一次漏汽导入五段抽汽改为导入四段抽汽的优化方案，并利用大修进行了实施。
Thus the optimization plan is made by diverting primary leakage to steam extraction of the fourth section instead of the fifth section.
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