the croaking of frogs蛙鸣Someone likened his voice to the croaking of a bull - frog.有人把他的声音比作牛蛙的叫声.He is forever croaking about his problems.他老是为他那些问题发牢骚....
这些超高频能传送均衡的宽频信号.These extremely high frequencies allow proportionately wider band - width signals to be transmitted.用途: 用于超高频频率转换, 负载振荡器, 宽频放大.Purpose: UHF frequency converter, local oscillator, wide band amplifier.用途: 用...