Small amounts of which one of the following elements/pairs of elements is added to steel to increase its machinability?

Small amounts of which one of the following elements/pairs of elements

1.	Small amounts of which one of the following elements/pairs of elements is added to steel to increase its machinability?
A.	Nickel
B.	sulphur and phosphorus
C.	Silicon
D.	Manganese and copper
Answer» E.

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Small amounts of which one of the following elements/pairs of elements is added to steel to increase its machinability?

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