关于修订GB8054－87表2的设计方法

采用统计量的标准化方法，研究了均值（μ）的单侧限计量抽样检验的理论与方法（σ２未知），在方差σ２已知的条件下，前人已经给出严格理论，并依据该理论制定了ＧＢ８０５４表１；在方差未知的情况下，制定ＧＢ８０５４表２的依据是不严格的，故抽样方案也是近似的，利用ｔ分布与非中心ｉ分布给出了精确的抽样检验理论，为修订国家标准ＧＢＱＤ８０５４表２提供了方法

The principle of simple drawing for line of intersecting surface and simple drawing methods for fold-line

This paper is aimed at the national standard mechanical drawing that permitting simple drawing for line of intersecting surface and replacing non-circle curve by arc or straight-line, and also illustrated the principle of simple drawing for line of intersecting surface, indicated the new simple method that replacing non-circle curve by fold-line.