亚声速流
sub-critical flow
subsonics
flow at subsonic velocity
subsonic flow
横向流亚声化学激光器
transversal flow subsonic chemical laser
超声声速
Speed of sound
ultrasonic pulse velocity
velocity of ultrasonic sound
ultrasonic velocity
Ultrasonic sound velocity
超声声速测量
Ultrasonic velocity measurement
超声声速法
ultrasonic velocity method
超声声速与衰减
Ultrasonic velocity and attenuation