wave speed， wave velocity

adar echo-wave signals

contiuous-wave echo signal

Echo Wave

echo wave detecting

echo wave signal alarm

echo-wave signal

line echo wave pattern

radar echo wave

Target echo-wave characteristic

ultrasonic wave echo measuring distance

wave-echo

3-D wave speed structure model of underground

acoustic wave speed

concrete wave speed

concretion wave speed

consolidation wave speed

constant wave-speed section

electromagnetic wave speed