Final answer:
A burnished CMU is made by treating a standard CMU with an oxyacetylene torch to produce a very smooth surface on one or more faces of the unit.
Step-by-step explanation:
A burnished CMU is made by treating a standard CMU with an oxyacetylene torch to produce a very smooth surface on one or more faces of the unit.
When an oxyacetylene torch is used, the heat generated from the combustion of acetylene in oxygen is applied to the surface of the CMU. This heat melts the surface, allowing it to become smoother.
The smoothness is achieved as the molten metal solidifies and forms a smooth surface.
Therefore, the statement is True.