【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】
【判断题】The equation method is a short-cut method that jumps directly to the solution ,bupassing the intermedate algebraic steps and using the concepts of contribution margin ratio or unit of contribution mar...
【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.