operational layer的相關資料：
臨近單詞
operational art
operational
Operational Test and Evaluation Force
operational tranconductance amplifier
Operational Transconductance Amplifier
Operational Status Recording Subsystem
Operational System Development Program
Operational Meteorological Information
operational resistance of molten layer
Operational Readiness Training Program
Operational Command and Control System
Operational Propellant Handling System
