| 摘 要： | In 1955-1956, M. Vertregt introduced the problem about the least take-off weight of step-rockets and gave a matbematieal model of this problem as well as some calculations~[1]. In 1957, M. L, Williams followed up the study and pointed Out that G_(CN) and G_(TN) satisfied the following relation~[2] G_(CN)=[V_(CN)~((1))+V_(CN)~((2))]G_(TN)+V_(CN)~((3))G_n, thereby developing the mathematical model in [1]. For details see [2] (in which the significance of symbols, such as G_(CN) etc. was explained).
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