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

Semi brittle materials can be extruded by

While rolling a strip the peripheral velocity of the roll is ..... A .... than the entry velocity of the strip and is ...... B .... the exit velocity of the strip
A. greater / less / equal to
B. greater than / less than / equal to

Collapsible tubes are made by