A formula derived by the author for calculation of arbitrary three centered arch type headings was introduced here with some modifications made to the conventional design and calculation methods.
介绍了所推导的任意三心拱巷道计算公式，并修正了拱形巷道传统的设计与计算。
Methods It is a randomized double-blind parallel controlled multiple-centered clinical study design. The inpatients 161 cases who accorded program and needed parental nutrition enter this study.
方法本研究为随机双盲、平行对照、多中心实验设计，符合研究方案、需要肠外营养的住院病人161例进入本研究。
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