筆劃查詢--U字頭 UAWG UDP UF UHF UHYS UJT ULCC Ultra High Frequency Unclean B/L Undercoat unfavorable balance of trade Uninterrupted Power System Univeral Resource Location Universal ADSL Working Group Universal Serial Bus UNIX unleaded gasoline Unpackage cargo UPC Up-Link UPS Upstream urea formaldehyde URL Usage Parameter Control USB used unit User Datagram Protocol U型鋼