| http://www.w3.org/ns/prov#value | - If both or either of them are shorter than 5 minutes, the pre-reducing and/or the reducing are liable to be insufficient.As to the reducing atmosphere for the pre-reducing and reducing of the hydroxide of the iron family metals, H.sub.2 gas, HNX gas, producer gas mainly comprising CO and H.sub.2, CO gas, ammonia gas, coke oven gas, natural gas, blast furnace gas,water gas, methane gas, and the lik
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