decimal numbering system
integer numbering system
universal numbering system
positive list system system
inter-backup system for central control system and district-level dispatch system
Single school system; Single track system; Unitary school system
Single track system; Single school system; Unitary school system
Unitary school system; Single school system; Single track system
corrugated sheet-iron (undulated sheet-iron)
nickel-plated steel sheet and nickel-plated punched steel sheet
sheet to sheet duplicator
single sheet apparatus for measuring specific total losses of magnetic sheet and strip
7-year system switching to 8-year system
Accounting environment Accounting theoretical system Accounting standards system
administrative management system of villages and towns and educational system