Sampling intervals, not numbers, without replacement.

采样间隔，不是数字，无需更换。

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Under simple random sampling scheme without replacement and unknown proportion of population possessing neutral attribute, the optimal allocation of sizes of two sub-samples is given.

对简单随机不放回抽样，在总体非敏感属性个体比例未知的情况下，给出了两个子样本容量的最优配置。

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This paper introduced several methods about the concrete strength inspection: the sampling method given by the present specification; simple random sampling without replacement; stratified sampling.

具体介绍了砼强度检测抽样的几种方法：现行规程抽样法；简单随机抽样法；分层抽样法。

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Aiming at defects which are exiting in image encryption algorithm based on chaotic sequences, this paper proposes an image chaotic encryption algorithm based on sampling without replacement.

针对现有基于混沌序列的图像加密算法的缺陷，提出一种基于不放回抽样的图像混沌加密算法。

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Aiming at defects which are exiting in image encryption algorithm based on chaotic sequences, this paper proposes an image chaotic encryption algorithm based on sampling without replacement.

针对现有基于混沌序列的图像加密算法的缺陷，提出一种基于不放回抽样的图像混沌加密算法。

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