positive carbon

threatening trade wars when these countries talk about wanting to bring in positive legislation to limit the import of high-carbon fuels,

以贸易战争为要挟，当这些国家希望立法限制高碳燃料进口，

The preparation of standard reference material of activated carbon has positive significances of standardizing markets, application and reducing measurement error during appliance and production, especially enhancing testing level and confirming products arbitration.

制备活性炭吸附性能标准样品，对于规范产品应用市场，减少应用和生产企业的产品性能测定误差，尤其对于提高和确定活性炭的质量检测水平和产品仲裁均有积极作用。

Iso-butene and methanol etherification proceeds according to the electrophilic addition mechanism, Iso-butene makes protonation reaction as the proton acceptor under the acid catalyst function, being born the positive carbon ion, intermediate products react rapidly with nucleophilic reagent ( CH3O-) to produce MTBE.

异丁烯在酸性催化剂作用下作为质子的接受体发生质子化反应，生成正碳离子；作为中间产物的正碳离子，再迅速同亲核试剂CH3O-反应，生成MTBE。

Positive temperature coefficient behavior of carbon material filled LDPE Composite

碳材料填充LDPE导电复合材料的PTC性能

Specially, those who are highly educated, high earners, aged 26-49 years and living in urban, have positive attitude and high acceptance, and show a clear willingness to pay for carbon-labeling food.

中高层次学历、中高收入、年龄在26-49岁的城市消费者对碳标签食品的态度积极、认可度高，表现出鲜明的支付意愿。

Positive Temperature Coefficient Effect of Carbon Fiber ( CF)-filled Polyethylene Composite Materials

聚乙烯/碳纤维复合材料的PTC效应