作出的角可能是异面直线所成的角也可能是它的邻补角在直观图中无法判定只有通过解三角形后根据这个角的余弦的正负值来判定这个角是锐角也 Template




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tomski作出的角可能是异面直线所成的角也可能是它的邻补角在直观图中无法判定只有通过解三角形后根据这个角的余弦的正负值来判定这个角是锐角也 coloring