Which of the following methods of tunneling is used for long tunnels at great depths ?

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Which one of the following tunnelling methods is used for laying under ground sewers ?

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What is the correct sequence of the following events of construction of a shaft in rock ?

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Assertion A : English method of tunneling requires more time as compared to other methods of tunneling. Reason R : In English method of tunneling, the masons and excavators have to work alternately/

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