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What are the disadvantages of top-down construction? Choose all statements that ...

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What are the disadvantages of top-down construction? Choose all statements that are correct.

It does not provide enclosure to the excavation area

0%

It requires an extensive strutting system

50%

It requires a large area around the site

0%

It requires a good ventilation and housekeeping system to clear dusts

100%

It has limited headroom for excavation

100%

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