Surveying
The sensitivity of a bubble tube can be increased by

decreasing the length of bubble
decreasing the radius of curvature of tube
increasing the diameter of the tube
increasing the viscosity of liquid

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By adding their longitudes if places are in the different hemispheres
All of these
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By subtracting their longitudes if places are in the same hemisphere

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