Sample complementing is the practical demand of sampling survey, and its also a difficult problem in sampling technology.
样本追加是抽样调查的现实需求，也是一个抽样技术难题。
In the theory of elastic thin plates, the bending of a free rectangular plate on the elastic foundation is also a difficult problem.
在弹性地基上的自由矩形板的弯曲，在弹性薄板理论中也是个难题。
Technique of three-dimensional object recognition is one of the most important techniques in video tracking system and also a difficult problem in it.
三维目标识别技术是电视跟踪系统中的关键技术之一，也是目前该领域亟待解决的一个难题。
Establishing and improving software process capability is the requirement of the high maturity level of CMM or CMMI, and also a difficult problem of software measurement.
建立和改进软件过程能力是CMM或CMMI高成熟度等级的要求，也是软件度量的一大难点。
Establishing and improving software process capability is the requirement of the high maturity level of CMM or CMMI, and also a difficult problem of software measurement.
建立和改进软件过程能力是CMM或CMMI高成熟度等级的要求，也是软件度量的一大难点。
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