以下为句子列表：
英文: In this paper, by means of macro-morphology inspection, chemical composition analysis, microstructure examiation, mechanical property testing and X-rays diffraction analysis, the fractured bolt and random sample bolt were analyzed.
中文: 摘要采用断口宏观形貌观察、化学成分分析、显微组织检验、力学性能则试及腐蚀产物的X射线衍射分析等手段，对断裂与部分抽检的卡瓦螺栓进行了综合试验分析。
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英文: The paper analyses the survey data about stratified random sample of 70 villages in Shandong Province by qualitatively and quantitatively.
中文: 摘要20世纪90年代以来，中国农业生产结构发生了巨大的变化，但人们对农户种植结构调整的主要影响因素有显著的不同看法。
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英文: The survey data were collected from a random sample of 496 ninth grade students in 15 probability proportionate multistage cluster classes in Taichung City and County, Taiwan in 2005.
中文: 本研究资料得自2005年台中县市的496位依县市接近等比例、乡镇市区及学校不重复原则的15个接近等比例、丛集随机班级样本。
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英文: Let (X,Y) be a R~d×R~ valued random vector and (X_,Y_), (X_,Y_) …(X_n,Y_n) be a random sample drawn from (X,Y).
中文: 设(X_,Y_),(X_,Y_),…(X_n,Y_n)为从取值于R~d×R~的总体(X,Y)中抽出的一个随机样本。
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英文: Methods 0 residents aged to years of Changping District, Shunyi District, Daxing District and Fangshan District were selected by stratified random sample method, questions were asked and all the investigators were trained.
中文: 方法采取分层随机抽样方法,从昌平、顺义、房山、大兴四区随机抽取～岁的农村户口居民0人,采用统一的行为危险因素监测调查表,由统一培训的调查员入户调查。
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