1.

_If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width$?

A. R + T
B. T - R
C. ‚à ö(R¬≤ + T¬≤)
D. R - T
Answer» D. R - T


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