空间两条异面直线的距离的求法及其公垂线的位置的确定 ,《数学通报》、《数学通讯》曾登载不少研究文章 .本文利用一个模型 ,给出空间两条直线位置关系的一个判定定理 ,并给出与空间两条直线有关的量的计算公式 .图 1　空间两直线如图 1,a,b是空间两条直线 ,A,B∈ a,AC⊥ b,BD How to determine the distance between two straight lines in space and the determination of the position of the public vertical line, “Mathematical Bulletin” and “Mathematics Communication” have published many research articles. This paper uses a model to give the positional relationship between two lines in space. A decision theorem, and gives the calculation formula of the quantity related to the space of two straight lines. Fig. 1 Two lines of space are shown in Fig. 1, a and b are two lines of space, A, B ∈ a, AC ⊥ b, BD