回声

Based on thedata,this article assessed the stocks of 23 species of 5 commercial taxonomical groups—Trichiuridae were assessed,Decapterus maruadsi,Trachurus japonicus,Nemipterusand Priacanthidae.

1997年12月至1999年6月，利用&北斗&号调查船配置的Simrad EK500回声探测-积分系统在南海北部海域进行了渔业资源声学调查，调查分春(4～6月)、夏(7～9月)、秋(10～12月)、冬(12～2月)4个季节进行。

It changed to be strong reflection after degeneration.2.On the growth of follicle,follicular cell produced prominency which keeps touch with oocyte rightly.

在发情周期内，有大小不一的发育卵泡和黄体；卵泡显示为无回声的团状黑影；黄体为均匀的深灰色细小颗粒组成，退化后成为强反射。2。

Jumper selection is not always easy, for instance on the single port TE122 it requires removal and reinstallation of the echo cancellation module.

跳线选择并不总是那么容易，例如在单一端口TE122，需要拆除和重新安装回声消除模块。

Results 17 of 22 premature newborns were present retrohepatic retrosplenic hyperechogenicity.

结果 22例早产儿中， 17例超声检查显示在肝脾后有弥漫的高强回声。

There is obvious negative correlation between dominant frequency and bodily size in Rhinolophidae, Vespertilionidae and Hipposideridae.

菊头蝠科、蝙蝠科和蹄蝠科回声定位信号能量最大处频率与体型呈明显的负相关，蝙蝠科相关性最好，其次为蹄蝠科，较差的为菊头蝠科；能量最大处频率与前臂长的回归线表明：对于前臂长相同的蝙蝠，蹄蝠科的能量最大处频率远远高于其它两科，菊头蝠科高于蝙蝠科。

Results: findings on 2d us included: irregular shape or spiculate margin were in 163 of 168 (97.0%) breast cancer; heterogeneous and hypoechoic echoes were in 165 of 168 cases (98.2%); micro calcification were in 86 of 168 cases (51.2%). in cdfi, blood flow was 98.8% found. 151 cases (90.9%) were found perforating blood vessels.

结果： 二维超声中，病灶形态不规则或有蟹足样突起者占97.0%，病灶内部回声低而不均匀者占98.2%，其中有微钙化者占51.2%，彩色多普勒血流显像中血流信号的检出率为98.8%，其中90.9%有穿入性血流，阻力指数≥0.70者占78.3%。

Qualitative assessment of the lesion and quantitative measurement were performed in both stenotic and reference segments.

根据斑块组成回声的不同，分为软斑块、纤维斑块、钙化斑块和混合斑块，后三者统称为硬斑块。

The techniques of subband adaptive filtering are used to design the Acoustic Echo Canceller in this dissertation.

本文利用子带自适应滤波技术进行声学回声消除设计。

Fetal head position; fetal movement can be seen; posterior placenta; fetal tentorial low-echo can be seen above the dark zone, size 1.2 * 0.7CM.

超声可见：胎儿头位；胎心胎动可见；胎盘后壁；胎儿小脑幕上方可见低回声暗区，大小1.2*0.7CM。

The observation centred on the constructive changes of teste ,epididymides and spermatic cords. The thicknesses and widths of the head,boby and cauda of epididymides were comparatively measured with opposite side. The sizes,morphosis,echo and the distribution of color flow of the masses were noted and the resistance indexes of the blood flow were determined.

方法对126例附睾结节行CDFI检测，重点观察睾丸、附睾、精索的内部结构，测量附睾头、体和尾的厚度及宽度，描述附睾结节的大小、形态、回声及彩色血流分布状况，并检测其阻力指数。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。