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group number
auto.	蓄电池识别编码用以表示蓄电池尺寸、接头形状、固定位置和其他结构特性
oil	组号
tech.	潮群编号; 分类指标

group number: 35 phrases in 17 subjects

Automobiles	1
Bridge construction	1
Business	1
Commerce	1
Communications	1
Earth sciences	1
Ecology	1
Economy	1
Electronics	8
Geophysics	1
Information technology	2
International trade	1
Rail transport	1
Scuba diving	1
Technology	11
Telecommunications	1
Water resources	1