The BIS recommends that the size of a door frame and window frame should be derived after allowing a margin of ______ mm alround an opening for convenience of fixing.

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1.	The BIS recommends that the size of a door frame and window frame should be derived after allowing a margin of ______ mm alround an opening for convenience of fixing.
A.	2 mm
B.	6 mm
C.	5 mm
D.	10 mm
Answer» E.

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