A semi-automatic or automatic rifle. The exhaust emission control system includes a monolith catalyst that includes an oxygen storage agent and a noble metal-based three-way catalyst including Pd, Rh, and Pt disposed at an upstream location in the exhaust gas flow in the internal combustion engine, and a perovskite-type double oxide having a three-way catalytic function disposed at a downstream location in the exhaust gas flow. 2octane or an enantiomer, mixture of enantiomers, or a racemate thereof, wherein an anion X\u2212 with a single negative charge is associated with the positive charge of the nitrogen atom; and a phosphodiesterase IV inhibitor and methods of using the same. The tension adjustment gauge system is more efficient and less time consuming to perform tension adjustments to the ball and ring coal pulverizer. By the mixing unit, a specific homogenization of the temperature of the water heated by the fluid heater is achieved.