| http://www.w3.org/ns/prov#value | - According to the embodiment, the reducing agent supplying means 29 is controlled by the controlling means 46 in accordance with the result of comparing the actual adsorption amount SNH3(n) and the target adsorption amount MNH3 and therefore, even when there is an error in the actual adsorption SNH3(n), the basic addition amount DNH3 of ammonia is pertinently corrected and therefore, a pertinent am
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