For stable structures, one of the important properties of flexibility – McqOptions

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1.	For stable structures, one of the important properties of flexibility and stiffness matrices is that the elements on the main diagonal1. must be positive of stiffness matrix2. must be negative of stiffness matrix3. must be positive of flexibility matrix4. must be negative of flexibility matrixThe correct answer is
A.	1 and 3
B.	2 and 3
C.	1 and 4
D.	2 and 4
Answer» B. 2 and 3

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