sinusoidal alternating current
正弦交变电流

• particle diameter
• particle path
• particle shape
• particle size
• particle sizing
• particular solution
• partition
• pascal
• Paschen-Back effect
• Paschen bands
• Paschen mounting
• Paschen notation
• Paschen serier
• passage
• passage zero
• passameter
• passatest
• passband
• passband ripple
• passimeter
• passivation
• passive and/or active iamge system
• passive cavity frequency stabilization
• passive fibre optics element
• passive iamging system