nox selective catalytic reduction
nox selective catalytic reduction
Nox选择性催化还原
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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In Europe the trucking industry has settled on a technology called selective catalytic reduction, in which urea is periodically injected into the exhaust system to break down the NOx, converting nitrogen oxides into (somewhat) harmless ammonia.
FORBES: Clearing the Air