高频率的

Guglielmo Marconi, recognizing the possibility of using these waves for a wireless communication system, gave a demonstration (1895) of the wireless telegraph, using Hertz's spark coil as a transmitter and Edouard Branly's coherer (a radio detector in which the conductance between two conductors is improved by the passage of a high-frequency current) as the first radio receiver.

Guglielmo Marconi，认可使用这些波浪的可能性为一个无线通信系统，给了一次示范(1895)无线通信机，使用赫兹的火花卷因为发射机和Edouard Branly 的coherer (导率在二个指挥之间被高频率潮流段落改进)的一台无线电探测器如同第一无线电接收机。

The successfully fabricated of the ir holographical optical element with curved and high average spatial frequency fringe pattern provide a new path for the optical system design on the precision measurment.

具有一定曲率和高空间频率的近红外全息光学元件的研制成功，为精密测试技术中的光学系统设计开辟了一个新的途径。

The minimum coefficient of nonlinear and intermodulation distortion, precision, stability and range of frequency are limited only by quality of the used sound card.

最低系数的非线性和互调失真，精确，稳定和一系列的频率是有限的，只有高质量的用於声卡。

This almost permanent storm occurs over the marshlands where the Catatumbo River feeds into Lake Maracaibo and it is considered the greatest single generator of ozone in the planet, judging from the intensity of the cloud-to-cloud discharge and great frequency.

这种几乎是永久性的风暴发生在卡塔通博河汇入马拉开波湖的沼泽地上空，从其云际放电的强度和高频率判断，这里被公认是我们星球上最伟大的单个臭氧发生器。

Raw meat in Kunming market has to undergo a rigorous inspection and management. Serving soup temperature is higher than the hygiene supervision and inspection standards. The operation accuracy of the consumers is related to gender, occupation, eating frequency and parasitological knowledge level. When the temperature of the serving soup is not high enough, actions of consumers are different.

昆明市场上的生肉受到严格检验检疫和多重监督管理；汤温达到卫生监督标准；顾客的科学操作比例与性别、职业、食用频率和寄生虫学知识程度有关；顾客遇到汤温不够高时的处理方式与性别、职业和对汤温的担心程度有关。

The receiving circuit adopts programmable gain amplifier and filter, enables the instrument to realize the automatic filter and the automatic adjusting enlargement factor according to the echo signal's different amplitude and frequency; Having AC and DC power supply modes, the system can satisfy different situation; Having adopted the big screen TFT LCD,caused the tested wave displaying intuitively;Having designed the toucher ,which enables the system to have a human-computer interaction function, helps user operate facilely.

接收系统采用程控滤波和程控放大，使得用户能根据回波信号的强弱和探头频率的不同而选择不同的滤波电路和放大倍数；交直流供电满足不同的应用场合；采用高分辨率大屏幕TFT液晶显示器，被测波形直观形象；触摸屏输入，操作方便。

Alkaline-earth metals have single ground state; the laser cooled alkaline-earth metals are idea system for accuracy spectroscopy and optical frequency standard.

碱土金属原子三重激发态具有很长的寿命，其跃迁频率的稳定度和精确度都很高，因此激光冷却的碱土金属原子是进行精密光谱和光频标研究的理想体系。

The accuracy of receiver clock parameter got from point positioning is not high enough to be introduced into the double difference equation. In order to get the accurate receiver clock error, high quality cymometer will be needed, while this is not applicable for the real work.

由于用伪距求得的接收机钟差不能满足精度要求，要想精确求得接收机钟差，需要高精度的频率计，这在实际应用中难以做到，而求解参考卫星站间单差模糊度的方法则是可行的。

The positive expression rates of Tissue Inhibitors of Metalloproteinase-2 protein in the cases of involuting groups were significantly higher than those in proliferating group and vascular malformation groups and normal skin group (P.05). Its difference was significant. Conclusions: Matrix MetallProtinase-2 and Tissue Inhibitors of Metalloproteinase-2 may play an important role in the pathogenesis of hemangiomas through angiogenesis. They may have no effect on vascular malformation and normal skin

血管瘤退化期，TIMP-2表达明显升高，说明 TIMP-2与血管瘤纤维化、消退有关，其机制可能是一方面通过抑制MMP-2介导的基底膜降解而在内皮细胞迁移、聚集中起作用，另一方面直接抑制内皮细胞的增殖及迁移，使内皮细胞高频率调亡，细胞外基质增多，组织出现纤维化，最终导致血管瘤的退化。2、血管畸形和正常皮肤小血管中MMP-2和TIMP-2不表达或表达较弱，说明血管畸形和正常皮肤小血管中并不存在异常的血管生成，据此可以对血管性疾病进行分型、分期，并指导临床治疗。

The results calculated show that the major contributions for the backscattering cross section come possibly from average cloud diameter, clear-air and humidity turbulence and also from distributions of cloud particles, especially, at higher frequencies.

再分析了云的后向散射机理，计算了西安地区云的后向散射截面；表明影响云的后向散射截面的主要因素为云滴平均半径、大气湿度湍流及云粒子分布，在较高频率时更显著。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！