《建筑技术》1981年第3期刊载了徐乃祥同志的《构件合理吊点和垫点的选择》一文。现对文中一些提法提出商榷。首先,徐乃祥同志认为,在两点起吊时,把构件简化为双悬臂梁,在均布荷载作用下,使吊点(或垫点)的弯矩绝对值与跨中弯矩相等,即 M_A=M_B=M_C,从而求得“合理”吊点的位置是 x=0.2071l,如图1所示。我认为照这样求得的“合理”吊点位置并不合理。因为按 M_A= M_c 所求得的 “Architecture Technology,” 3rd Issue, 1981, contains an article entitled “Selection of Reasonable Hanging Points and Mat Points” by Comrade Xu Naixian. Some of the references to the text are now discussed. First of all, Comrade Xu Naixiang believes that when lifting at two points, the components are simplified as double cantilever beams. Under uniform load, the absolute value of the bending moment of the lifting point (or pad point) is equal to the mid-span bending moment, that is, M_A= M_B=M_C, so that the position of the “reasonable” hanging point is x=0.2071l, as shown in FIG. 1 . I think that the “reasonable” hanging point that is obtained in this way is not reasonable. Because according to M_A= M_c