In order to give a complete secondary balance of a multi-cylinder in-l

1.	In order to give a complete secondary balance of a multi-cylinder in-line engine,
A.	the algebraic sum of the secondary forces must be equal to zero
B.	the algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
C.	both (a) and (b)
D.	none of these
Answer» D. none of these

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In order to give a complete secondary balance of a multi-cylinder in-line engine,

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