Spiral gears are used only if the axes of two shafts are non-intersect

1.	Spiral gears are used only if the axes of two shafts are non-intersecting, non-parallel and __________.
A.	perpendicular
B.	parallel
C.	non-perpendicular
D.	none of the above
Answer» D. none of the above

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Spiral gears are used only if the axes of two shafts are non-intersecting, non-parallel and __________.

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