岩体声发射
Rock accoustic emission
acoustic emission in rock mass
rock AE
acoustic emission of rock
调频立体声广播发射机
FM stereo broadcast transmitter
固态立体声调频广播发射机
solid state FM stereo transmitter
晶体管高频信号发声器
HF transistorized signal generator
立体声调频广播发射机
frequency modulating stereo transmitter
流体动力式声波发生器
hydrodynamic acoustic generator
hydrodynamic sound generator
全固态立体声调频发射机
all solid state FM stereo transmitter
超声激发声发射
Ultrasound-stimulated acoustic emission (USAE
claims frauds
强声发声器
High intensity sound generator
突发声发射
discrete acoustic emission