这种新型战斗机的巡航速度为声速的两倍。
目的了解足位变化对跟骨超声骨密度检测声速的影响。
Objective To explore the effect foot position on detection of speed of sound during ultrasonic detection of calcaneal bone mineral density.
通过对超声纵波声速的测量来评定船用TA2钛合金的平均晶粒尺寸。
Ultrasonic velocity measurements have been used to estimate average grain size in TA2 ship titanium alloy.
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