square wave power source 交流方波焊接电源
square- wave power source 方波电源
square-wave signal source 方波信号源
ac square wave power source 交流方波电源
square-wave ac power source 方波交流电源
square-wave current power source 方波电源
square wave welding power source 方波焊接电源
voltage source square wave inverter 电压源方波逆变器
The square wave source is an impulse source in which digital technique is used. It has the advantages of rigid phase, high frequency stabilization and high antijamming.
方波电源是采用数字技术的脉冲电源，具有相位严格、频率稳定度高，抗干扰能力强等独特的优点。
When a wave travels uniformly in all directions from a small source, the intensity varies inversely as the square of the distance.
当波从小扰动源向各个方向均匀传播时，其强度的变化与距离的平方成反比。
Sound waves travel outward like balloons expanding around their source. The sound's power is distributed on the surface of the wave which increases with the square of the distance from its source.
声波的扩散就好比气球的膨胀，声波从声源向四周扩散，声音的能量也随着声波四散开来。
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