主题：【原创】梦回中国（5） -- 万里风中虎
是覆盖30-33的二级子目录，其中三级子目录见下表，四级子目录参见使用手册中SIC92的行业分类。
ELECTRICAL AND OPTICAL EQUIPMENT 30t33
Office, accounting and computing machinery 30
Electrical engineering 31t32
Electrical machinery and apparatus, nec 31
Insulated wire 313
Other electrical machinery and apparatus nec 31x
Radio, television and communication equipment 32
Electronic valves and tubes 321
Telecommunication equipment 322
Radio and television receivers 323
Medical, precision and optical instruments 33
Scientific instruments 331t3
Other instruments 334t5
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