Origins of crack in JinKeng arch dam that are discussed in this article are variety, but the direct origin is that dam body suffers sudden fall of temperature in operating period.
本文讨论的金坑拱坝裂缝的成因具有多重性，其直接成因是坝体经受了气温骤降的恶劣运行工况。
The process comprises: the preparation before nitriding, the preparation period, the temperature-rise period and the temperature-fall period of the nitriding process.
工艺过程为：氮化前的准备工作，氮化过程的准备阶段、升温阶段和降温阶段。
The process comprises: the preparation before nitriding, the preparation period, the temperature-rise period and the temperature-fall period of the nitriding process.
工艺过程为：氮化前的准备工作，氮化过程的准备阶段、升温阶段和降温阶段。
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