In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than____________________?
(A) two members with unknown forces of the frame
(B) three members with unknown forces of the frame
(C) four members with unknown forces of the frame
(D) three members with known forces of the frame
(E) four members with two known forces
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