第二十条招标文件不得要求或者标明特定的生产供应者以及含有倾向或者排斥潜在投标人的其他内容。

Article 20 No tender document may require or specify any specified producer or supplier or contain any other contents favoring or excluding intended bidders.

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在招标文件要求提交投标文件的截止时间后送达的补充或者修改的内容无效。

The supplements or modifications served after the deadline for submission of tender documents as required by the bid documents shall be invalid.

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投标前应分析有关因素，提出申请，了解招标文件的内容要求，并制订调研计划；

A tender should make analysis to various factors, submit application, study the requirement and content of tendering document, and make a investigation and study plan.

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