高频率的

The field directionality, represented as a set of planewaves that are induced by the far-field sources, where only few of them are of the high amplitude, is com- pressible at the wavenumber-frequency space (spikes in the abovementioned terminology).

场方向性在波数－频率空间（在上面提到的术语中是尖峰）是可压缩的，这里场方向性表示为一组由远场源感生的平面波的场方向性，这些平面波中几乎没有高幅值的。

Arbitrary waveform generator is widely used in experiment and practical work as signal sourer. Apply the HSO function of 8OC198KC MCU to generate PWM waveform, then use the PWM to compose arbitrary waveform. The concrete hardware control circuit and the software realization method are presented. Then take the three-phase SPWM waveform generator for example, pot forward the application circuit and show the result of test. Experiment shows that the waveform distortion of sine, triangle and sawtooth is small and the operation is simple. The performance is high.

任意波形发生器作为信号源，在实验教学和实际工作中有着广泛的应用；应用Intel公司80C196KC单片机的HSO功能产生PWM波形，再由FWM波合成频率在20~100Hz之间的任意波形；设计了具体的硬件控制电路和详细的软件实现方法，并以三相SPWM波形发生器为例，给出了实际应用电路及其测试结果；实验结果表明，该波形发生器产生的三相正弦波，三角波、锯齿波失真度小，操作简单，直观，性能价格比高。

In this double-blind study, 142 women with high-risk singleton pregnancies received 100 mg progesterone or placebo daily by vaginal suppository. Between 24 and 34 weeks of gestation, all subjects had uterine contraction monitoring with an external tocodynamometer once weekly for 60 minutes.

对早产的高危险孕妇来说，预防性地在阴道使用progesterone可降低子宫收缩的频率，并减少早产的发生，虽然目前我们还不清楚它的作用机转为何，但我们知道它对子宫肌肉层有2种作用：一为藉由抑制细胞质内动情素受体的取代而抑制动情素发挥作用，另一个则是经由它自身的细胞性受体而直接作用在子宫的生合成路径上。

Seismic imaging in Northeast Sichuan is greatly influenced by the widely distributional carbonate,strata juxtaposition with swelling and concaving,superimposition and connection between different wave fields,complex interlayer contact conditions,static corrections, high and steep structure ,as well as rapid change of seismic velocity in the area.

针对川东北地区碳酸盐岩高度发育，地层隆凹相间，各种波场交叉叠置，层间接触关系复杂，以及静校正问题、高陡构造及速度变化快等影响因素突出的特点，通过分析地表因素、有效波频率、静校正量及膏岩层效应对地震资料品质和成像的影响，研究和开发出三维折射波静校正以及构造建模层速度约束偏移成像等一系列处理技术，消除了众多因素对地震成像的影响，并在宣汉达县地区得到良好的应用效果，为普光特大气田的大规模开发奠定了基础。

Although my individual is distained very much,rely on friendly catenary completely to pull the technique that uses a rank, but friendly catenary is remained in the action in the rank beyond question, friendly to increasing on one hand for SEO catenary expresses voting addition, exchanged a link to be able to accelerate the newer frequency of oneself website with the station with tall weight on one hand additionally.

虽然我个人很鄙视完全靠友链拉动排名的手法，但是友链在排名中的作用仍然是毋庸置疑的，对于SEO来说一方面增加友链表示投票的增加，另外一方面跟权重高的站交换了链接能加快自身网站的更新频率。

Range of operating frequencies, programmable burst length and programmable latencies allow the same device to be useful for a variety of high bandwidth, high performance memory system applications.

一系列的操作频率，可编程的突发长度和可编程的潜伏期，使相同的器件是有用的各种高带宽，高性能存储系统的应用。

Results About39.3%of surveyed students considered that they paid more attention to the relationship between diet and health.The frequency of off-campus eating among students was higher,the statistical significance was found between campus-es and between female and male students.About25.5%of the students in Chigang Campus enjoyed eating out3or more times per week.Only21.2%of the students considered that meals served by refectories were fit for their appetite.

结果 39.3%的大学生认为自己很重视饮食与健康的关系；大学生在校外用餐的频率较高，校区之间和性别之间差异有统计学意义，其中某校区有25.5%的学生每周外出用餐3次以上；仅有21.2%的大学生认为学校食堂的菜肴符合自己的口味。

With the development of semiconductor devices, the switching frequency of PWM converters becomes higher, which makes PWM converters (mainly high-frequency transformers, inductors and capacitors in converters) smaller, and this will benefit design and application of them. Whats more, higher switching frequency will reduce the audio-frequency noise and improve dynamic response of PWM converters.

随着半导体器件技术的不断发展，PWM变换器所能达到的开关工作频率越来越高，使得变换器(主要是变换器中的高频变压器、电感等磁性元件和电容)的体积和重量越来越小，这有利于PWM变换器的设计及推广应用。

Electrodeposition during brush plating could be changed at a broad area with the inverter by controlling wave, frequency pass arid close and average value of electric current. Electrocleposition process of metal ion was changed and brush plating coating with tine grain, high hardness and good wear resistance was obtained.

逆变焊镀充电多功能电源通过控制电流的波形、频率、通断和平均值，使刷镀过程的电沉积在很宽的范围内变化，改变了金属离子的电沉积过程，获得了晶粒细密、硬度高、耐磨性好的刷镀层。

The parameters of pulse combustor such asfrequency,length of feed tube drying tube effecting on drying property were analyzed.It ispropitious to dry high surface-water containing,small granule or liquid materials.

分析了脉动燃烧器频率、热负荷、干燥管长等参数对干燥性能的影响；发现脉动燃烧器尾管内干燥更适合于含表面水高的小颗粒物料或液体物料，可充分利用脉动气流和声波能的作用，使物料分散雾化，增大表面积，提高干燥效率；研究了脉动燃烧器尾管内干燥颗粒物料的传热特性，并将试验结果与其它类型的干燥器进行了比较。

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！