The results show that all the three types of catalytic converters can make the HCNG engine meet enhanced environmentally friendly vehicle (EEV) emission standard.
试验结果表明：三种催化器都能使天然气掺氢发动机排放达到环境友好型汽车标准。
The results show that all the three types of catalytic converters can make the HCNG engine meet enhanced environmentally friendly vehicle (EEV) emission standard.
试验结果表明：三种催化器都能使天然气掺氢发动机排放达到环境友好型汽车标准。
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