以下为句子列表：
英文: Abstract: In this article,the optimization of surface crack detection of speed reducer gear was made using fuzzy set theory,the result show that the rotation magnetic field is the best way of surface crack detection and lots of extending surface fatigue c
中文: 文摘:采用模糊集的贴近度计算对齿轮表面探伤方法进行了优化选择，表明旋转磁场探伤是齿轮表面探伤的最佳方法，在实用中检测出大量的正在延伸扩展的表面疲劳裂纹。
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英文: Because the observation of interior crack is not always available, this paper laid emphasis on surface crack of segments.
中文: 由于管片内部裂缝观测难以实现，故重点研究了表面裂缝的影响。
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英文: Since the influence of crack on the durability of segments is uncertain and fuzzy, this paper established the durability damage membership functions for the segment surface crack width, length, orientation and density respectively.
中文: 同时，鉴于表面裂缝对管片结构的耐久性影响具有模糊性的特点，分别建立了用于计算评价管片表面裂缝宽度、长度、方向和密度等因素对管片结构耐久性损伤的模糊隶属度函数。
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英文: Taking Maluping mine, Kaiyang Phosphate Ore Zone as an example, change of mine water amount, its evolution process and law of correlated factors to crush into the pit due to ground surface crack with increases in mining depth, are descryibed.
中文: 摘要以开阳磷矿区马路坪矿为例，描述其矿山随着采矿深度的增加造成地表开裂变化及其矿坑水的水量变化和溃入矿坑的相关因素的演变过程和规律。
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