Final answer:
A split-face CMU is not made by treating a standard CMU with an oxyacetylene torch. Oxyacetylene torches are used in metalworking processes, such as cutting and welding.
Step-by-step explanation:
A split-face CMU, or Concrete Masonry Unit, is not made by treating a standard CMU with an oxyacetylene torch. Instead, split-face CMUs are manufactured by splitting a standard CMU along one or more faces. This creates a rough, textured surface on the split faces, giving them a unique appearance and providing better bonding with mortar.
Oxyacetylene torches are used in metalworking processes, such as cutting and welding. The torch produces heat by combusting acetylene in oxygen, which releases energy and melts metal being cut.