Q267
A timber prop is expected to support a roof area of about . . . . . . . . all around.
A.
0.2 - 0.3 m
B.
0.4 - 1 m
AnswerC.
0.9 - 1.2 m
D.
1.5 - 1.8 m
Answer: Option B
Solution
Answer: Option B
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