A. 光纤 B. 细缆 C. 屏蔽双绞线 D. 非屏蔽双绞线
A. Teacher-SelectedBranching B. GeneralBranching C. Grouping-BasedBranching D. Tool-OutputBranching
A. ≦0.1 B. 0.1-00.3 C. 0.3-0.5 D. 0.5