The angle between skew back of a flat arch and the horizontal, is kept approximately equal to

The angle between skew back of a flat arch and the horizontal, is kept

1.	The angle between skew back of a flat arch and the horizontal, is kept approximately equal to
A.	0°
B.	30°
C.	60°
D.	90°
Answer» D. 90°

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The angle between skew back of a flat arch and the horizontal, is kept approximately equal to

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