partial difference equation
偏差分方程

• photoconductive tube
• photoconductivity
• photoconductivity switching
• photoconductor
• photoconductor array axis
• photoconductor -thermoplastic film
• photoconverter
• photo copier
• photocopy
• photocopying machine
• photocount distribution
• photo counters
• photocounting
• photocount statistics
• photo coupler
• photocurrent
• photocurrent nosie
• photo CVD equipment
• photocyristors
• photod
• photodecomposition
• photodegradation
• photodensitometer
• photodensityometry
• photodepolarization