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A |     8月25日消息，近日，市场监管总局（国家标准委）批准发布《车用压缩天然气》（GB 18047-2026）强制性国家标准，将自2027年8月1日起实施。     新标准替代现行GB 18047-2017版本，旨在提升产品质量、保障使用安全、促进贸易公平。    甲烷值是衡量天然气抗爆性能的指标，类似于汽油的辛烷值。甲烷值越低，发动机爆震的可能性越高，长期使用低甲烷值天然气会损害发动机寿命并影响动力输出。    新标准首次将甲烷值纳入强制性技术指标，明确车用压缩天然气的甲烷值应不小于65，与欧洲标准要求保持一致。     同时规定，当甲烷值小于70时，加气站须在经营场所显著位置向社会公示具体数值，让车主知情选择。    CRESCENT CITY, Calif. -- A Northern California sheriff's deputy was found dead in her home and her boyfriend was later arrested arrested in Oregon on suspicion of killing her, authorities said. The body of Deputy Deanna Esmaeel was discovered Thursday at the residence in coastal Crescent City, California, the Del Norte County Sheriff's Office said in a statement. An arrest warrant was issued for Daniel James Walter, who was last seen near Esmaeel's house on the day of the killing. Authorities in Curry County, Oregon, found Walter's black Mazda sedan on Friday and he was arrested a short time later, officials said.Sheriff's officials didn't say if the 54-year-old suspect had an attorney and contact information for Walter could not be found on Sunday. Esmaeel was the mother of actor Marty York, best known for a role in the 1993 movie “The Sandlot.” Esmaeel had worked as an animal trainer on film sets for decades before making the change to law enforcement in 2021, SF Gate reported Sunday. York wrote on Instagram Friday that he had been informed of his mother's death.“The emotions I have are horrible right now between rage, vengeance, crying," York said. Walter was charged in March with unauthorized entry into a dwelling, according to According to Del Norte County court records obtained by SF Gate. It’s not clear whose dwelling he is accused of unlawfully entering.Del Norte County Sheriff Garrett Scott said his office was heartbroken by the loss of one of its deputies. "Our hearts and prayers go out to her family, friends, and co-workers," Scott said in a statement.。     新标准还新增了互换性要求，同一地区的车用压缩天然气应能互换使用，确保不同气源的天然气在切换使用时不影响发动机性能和安全性。这意味着车主在不同加气站加气时，不必担心气源差异导致车辆运行异常。    试验方法方面，新标准新增或调整了高位发热量、总硫、硫化氢、二氧化碳、氧气、水露点、水含量等项目的检测方法。

B |     其中甲烷值计算方法新增丙烷爆震指数法（PKI-MN法）作为仲裁试验方法，与国际标准接轨。    取样与判定规则也进一步完善，新增“取样”独立章节，取样点设在车用压缩天然气交接点，检验结果达到全部质量要求视为合格，不符合时应复测。    

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