Give two advantages of a four-high rolling mill opposed to a two-high rolling mill for the same output diameter.

Four- high rolling mill                              Two-high rolling mill

1.Small roll radius.That is why required  1.High roll radius.That is  required low power.           .                    why required high power.

2.  Low roll separating force.                   2.High roll separating

                                                                        force

the correct answer is c.stops after infancy and childhood.

myelin is the substance of the central nervous system (cns) that insulates nerve cell axons to increase the speed at which nerve impulse travels. myelination is a process of myelin formation. this process occurs postnatally, begins in the embryo during the midst of early development and finishes after birth.