声速的

Using the data of sound velocity experiments, static high-pressure research and geophysics, the temperature coefficient of enstatite′s compressional wave velocity, thermal and density anomalies in lower mantle are estimated.

在上述的数据分析过程中，还得到了下地幔区钙钛矿型SiO〓相态纵波声速的温度系数，并由此估算出下地幔底部的温度异常幅度为65-137K，〓约为2.8/。

Based on the prior information obtained by qualitative inversion, the two stages inversion method was put forward. That is, the first stage is that distinguishing the high-quality element and non- high-quality element, and determining the initial iteration value of element sound velocity reasonably. The second stage is that treating differentially the constraint weights of the high-quality element and non- high-quality element, and then quantitatively inversing the final sound velocity distribution. The results of two concrete specimens indicate that the two stages inversion method can inhibit artifacts effectively and has better defect identification effect than normal one stage inversion.

在获取定性反演先验信息的基础上，提出了两阶段反演的方法：第一阶段，区分优质像元和非优质像元，合理确定像元声速的迭代初值；第二阶段，区别对待优质像元和非优质像元的约束权重，定量反演最终的速度分布。2个混凝土试件的模型试验表明，两阶段反演能有效抑制伪像，具有比常规的一阶段反演更好的缺陷识别效果。

The signal fluctuations, the impact of temperature on the speed of sound reasons, ultrasonic ranging system ranging accuracy improved much more restricted, This also affected the ultrasonic ranging system in a number of precision applications demanding occasions, the problem of great practical significance Research

由于信号起伏、温度对声速的影响等原因，超声测距系统测距精度的提高受到很大的限制，这也影响到了超声测距系统在一些精度要求较高的场合的应用，所以这个问题的研究有很大的现实意义。问题补充：翻译软件译的就不要再贴上来了！

The experimental results agree with the accepted value of the speed of sound in air, i.e.

实验得出的结果与在空气中的声速的认可值，即

It is hard to discern the change of sound oscillation with our hearing in general experiment for mensurating velocity of sound.

在一般测定声速的实验中，利用听觉很难辨别声波干涉形成的振动加强和减弱的变化。

The paper analyzed variation of temperature, density and velocity of sound in the west pacific based on LEVITUS database using CSIR.

利用样条插值重构方法对LEVITUS数据库中的温度、密度和声速的月平均变化规律进行了分析，得到的海洋要素平面分布。

Based on the analysis of logging data, i t is found that effect of porosity and s hale content on acoustic velocity is hea vier than that of water saturation on it .

根据对实测测井解释资料的分析，认为孔隙度和泥质含量对纵波声速的影响大于含水饱和度的影响。

The delivery of high-speed jet is equivalent to several times the speed of sound, so jet pump can easily handle large capacity in a vacuum and the material.

其输送的高速喷射相当于声速的几倍，因此喷射泵也能够轻而易举地在真空中处理大容量的物质。

The cruising speed of this new type of fighter is Mach two.

这种新型战斗机的巡航速度为声速的两倍。

The A-4 soared supersonically to a history-making height of nearly 60 miles, functioned perfectly.

在1942年10月3号，A-4超声速的冲入创造历史的接近60英里的高度，运行一切正常。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。