(A) perpendicular distance between intra-dos and extrados
(B) vertical distance between springing line and intrados
(C) perpendicular distance between springing line and extrados
(D) none of the above
(A) perpendicular distance between intra-dos and extrados
(B) vertical distance between springing line and intrados
(C) perpendicular distance between springing line and extrados
(D) none of the above
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