The most important materials of the core are ______ a. Nickel and cobalt b. Ferrous and cobalt c. Nickel and ferrous d. Aluminium and cobalt

The most important materials of the core are ______ a. Nickel and cob

1.	The most important materials of the core are ______ a. Nickel and cobalt b. Ferrous and cobalt c. Nickel and ferrous d. Aluminium and cobalt
Answer» c. Nickel and ferrous