Upper left horizontal force 20kn --> on girder
ijkl
underneath is another horizontal force 40kn --> on girder
efgh
bottom is a, b, c, d all fixed. heights between ground and
girder efgh is 4m, b/t efgh and ijkl also 4m. length b/t a and b is
4m, b/t b and c is 5m, and b/t c and d is 4m.

answer:

c

explanation:

answer:

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3: cost reduction.

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