A cup of $$10$$ $$cm$$ height and $$5$$ $$cm$$ diameter is to be made from a sheet metal of $$2mm$$ thickness. The number of deductions necessary will be

Seamless long steel tubes are manufactured by rolling, drawing and .............

At $${1000^ \circ }C$$ the crystallographic structure of iron is ....................

For angle measurement in metrology, the following pair can be used in conjunction with each other