Technician A says that methyl hydrate is a de-icing fluid.Technician B says that alcohol is introduced into brake systems to lubricate pneumatic valves.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Technician A is correct because methyl hydrate, also known as methanol, is indeed used as a de-icing fluid due to its ability to lower the freezing point of water. Technician B is incorrect because introducing alcohol into brake systems is not a practice for lubricating pneumatic valves; it can actually damage the system by deteriorating rubber seals and other components.