国际专利分类号
International Patent Classification IPC
anti-smoking attitude
ipc
国际海事组织类号
International Maritime Organization class {= IMO class
中国图书分类号
the classify number of books in china
管分类号
pipe schedule number
roughing filter roughing bed
Lyapunov-Krasovskii稳定性理论中图法分类号TP18
Lyapunov Krasovskii stability theory