【单选题】For the structure shown in the figure, the stiffness of each member is as shown. If displacement method is used to analyze the structure, the coefficient【图片】 in the equation is:【图片】
【单选题】The following information for advertising and sales has been established over the past six months: Using the high-low method which of the following is the correct equation for linking advertising and ...
【判断题】The equation of Carothers method is derived based on an asumption that gelation occurs when the degree of polymerization becomes infinitely large.