扩展功能包括了23基本常数，对金属系列活动，公制前缀和超导材料的历史概况说明清单。
Extended features include a list of 23 fundamental constants, illustration of the activity series of metals, metric system prefixes and a historical summary of superconducting materials.
开发公制低断面轻型载重子午线轮胎系列产品。
The metric low profile radial light truck tire series were developed.
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