Question

what we call a crane use to lift heavy objects ?

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Answer 1

Answer:

Obviously because trucks can't hold heavy objects, like metals or other busted house remaining.  Cranes are used mainly in construction areas of transporting cement and rock even tmt (Fe rods used in construction) pipe and rods for support.

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Answer 2

a crane used to carry heavy things such as heavy iron trash and heavy iron pillar is called over crane