The width of a manhole is kept not less than 0...

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The width of a manhole is kept not less than 0.75 m but not more than 1 m - why?

A. to allow 2 persons to enter easily for shelter

B. not to allow the tub to enter into the manhole

C. to keep stone dust bags etc. inside it

D. all of the above

Answer: Option B

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