以下为句子列表：
英文: 4 methods for determination of open-flow potential in gas well are discussed, including their theoretical bases, practiceal significances, computing accuracy, applied conditions, advantage and deficiency, inherent relations among the methods.
中文: 摘要讨论了4种确定气井无阻流量方法的理论依据和实际意义，计算精度与应用条件，优点与不足，不同方法之间的内在联系。
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英文: A description is given of the analytical method for the determination of the urea content in slow-release urea by the p-dimethyl aminobenzaldehyde spectrophotometry.
中文: 摘要介绍用对二甲氨基苯节醛分光光度法测定缓释尿素中尿素含量的分析方法。
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英文: A Determination Method of Contents of Resins and Asphaltenes in Oily Waste Water by Ultraviolet Spectrophotometer;
中文: 含油污水中胶质和沥青质含量的紫外测定方法
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英文: 0. 70%, 8. % and . % in blue clayed paddy, respectively 8. %, . 9% in paddy field on quaternary red clay(no determination the microbiai biomass phosphorus), respectively.
中文: 在青紫泥田中分别平均降低了0.70％、8. ％和 .％； 在黄筋泥田中分别平均降低了8.％、.9％(因其酸度较低，微生物生物量磷的测定方法与前两种土壤的不同，所以未测定其中的微生物生物量磷的含量)。
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英文: (HSO-HO method. 0.7±0.0ppm, c.v..0%, certified value is 0.9± 0.7ppm) respectively. Result for hexavalent chromium determination in stewed baby clams and fish with tomato juice is 0.0 ± 0.00ppm, c. v.
中文: V..％(H_SO_-H_O_法:0.7±0.00ppm,C.V..0％,保证值为0.9±0.7ppm)。
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