The invention relates to a method for testing liquid and gaseous fuels and combustibles in general and testing the erosivity of low-sulfur combustibles in particular. In particular, the invention relates to a pharmaceutical composition for inhalation in the form of powder comprising at least a first and a second powder, in which at least said first powder contains an active agent in an amount greater than 1% by weight with respect to the weight of said first powder. The touch sensor is in communication with the local computer, and the interactive interface is accessible by the user from outside the vehicle and through the window glass. The composition can include from 62 to 69 mol % of 2,3,3,3-tetrafluoropropene and from 38 to 31 mol % of 1,2-difluoroethylene at a temperature of between \u221230\xb0 C.