In the past few decades, experimental research methods showed a steady increase trend in economics, especially in the field of labor economics.
在过去的几十年中，实验研究方法在学特别是劳动经济学领域中的应用呈稳步增加的态势。
Abstract: in % the past few decades, experimental research methods showed a steady increase trend in economics, especially in the field of labor economics.
摘要：在过去的几十年中，实验研究方法在%经济学特别是劳动经济学领域中的应用呈稳步增加的态势。
It also guarantees the accuracy of experimental data of railroad tank car valves, improves the overhaul quality, and thus ensures the traffic safety and reduces worker's labor intensity.
保证了铁路罐车阀类试验数据的准确性，提高了检修质量，从而保障了行车安全，减轻了工人的劳动强度。
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