An imaginary line tangential to the longitudinal curve of the bubble tube at its middle point called ?

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Gopal Sharma

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Q. An imaginary line tangential to the longitudinal curve of the bubble tube at its middle point called ?

(A) axis of telescope
(B) axis of level tube
(C) level line
(D) line of collimation

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✅ Correct Answer: (B) axis of level tube

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