Ex.11-1 Why levels are usually called as “spirit level”?

Ex.11-2 Explain the importance of level tube in a levelling instrument.

Ex.11-3 Explain the chief feature of a digital level.

Ex.11-4 State the differences in the temporary adjustment of a dumpy level and an IOP level.

Ex.11-5 State the difference between a dumpy level and a digital level.

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