1.

For calculating the traverse area, which of the following is crucial?

A. L = 0, D = 0
B. ∑L2 = 0, ∑D2 = 0
C. ∑L ≠ 0, ∑D ≠ 0
D. ∑L = 0, ∑D = 0
Answer» E.


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