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Question
Pick up the correct statement from the following?
Options:
A .  The boning rod is used for checking the levels of the sewer inverts
B .  Manhole covers are made circular for the convenience of the cleaning staff
C .  A manhole is classified as shallow manhole if its depth is less than 0.9 m
D .  All the above
Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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