If N is the algebraic difference of grades, S is the head light beam d – McqOptions

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1.	If N is the algebraic difference of grades, S is the head light beam distance in metres, the length (L) of a valley curve, is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
E.	[E].
Answer» B. [B].

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