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3. If a rigid body is in equilibrium under the action of three forces, then | |
A. | these forces are equal [Wrong Answer] |
B. | the lines of action of these forces meet in a point [Wrong Answer] |
C. | the lines of action of these forces are parallel [Wrong Answer] |
D. | (b) and (c) above [Correct Answer] |
E. | none of the above. [Wrong Answer] |