高频

Methods 44 patients with ectopic pregnancy chose conservative treatment and monitored by transvaginal colour dopper sonography.

以高频探头经阴道对44例宫外孕患者药物保守治疗过程进行动态观察。

Except for the high frequencyvibrations related to the changes of bond lengths and bond angles,the low frequencyvibrations related to the changes of double plane angles contribute to the internalreorganization energy significantly.

除与键长，键角变化相应的高频振动的贡献外，与二面角变化相应的低频振动对内重组能也有显著贡献，这也是导致〓，〓，及〓体系内重组能及自交换速率常数不同的主要原因。

By means of polymerase chain reactionand DNA recombinant techniques,the gene encoding mature ouse IL-4 was obtained from plasmid pCD-mIL4 and was inserted into expressionvector pBV220,which contains _RP_L double promoters,synthesized SD sequence and temperaturesensitive CIts857 gene,thus an expression lone eferred as pBV-mIL4 was constructed.

该质粒含有 P_RP_L 串联启动子，合成 SD 序列和温度敏感的CIts857基因，并且去除了完整小鼠 IL—4 cDNA 中3′侧翼非编码区，以原核系统高频使用的强终止密码子TAA 代替了原小鼠 IL-4基因的终止密码子 TAG，经 SDS-PAGE 及凝胶密度扫描分析，表达的重组小鼠 IL-4分子量约为14.2KDa，占总菌体蛋白量的25～30%。

This paper develops a high-frequency welding power source with double-ended flyback topology.based on SG3525 a new type of control program is designed which with controlled pulse energy output characteristics, pulse width and frequency can be controlled, to control output energy.

本文给出一种基于双端反激式主电路拓扑和SG3525 PWM控制芯片，研制了一台高频脉冲能量可控式焊接电源，该电源通过对输出电流的脉宽和频率单独控制，从而控制输出能量。

SiC is a very promising material for high temperature, high power, high frequency, and radiation application because of its superior properties such as wide band gap, high critical breakdown field, high thermal conductivity and high saturation electron drift velocity.

SiC材料具有宽禁带、高临界击穿电场、高热导率、高载流子饱和漂移速度等优良特性，这些特性决定了它在高温、大功率、高频和抗辐照等方面的有着广泛的应用前景。

The system is comprised of a 12 low frequency driver and a large-format, high frequency compression driver, coupled to a constant-directivity 90° x 40° horn.

该系统是由一个12低频驱动器和一个大型的格式，高频压缩驱动器，加上一个恒定指向90 °× 40 °角。

In this paper,a novel wire feeding system composed of special motor driver circuit with high frequency and print motor with low inertia was designed,and the performance test were carried out.

采用特制的高频可逆调速电机驱动电路配合低惯量的印刷电机，研制了一种适用于GMAW焊接电源的新型可逆调速送丝系统。

MD-12 is a solid high-power frequency of the two systems, there is a strong 12-inch low frequency driver and a 1-inch high frequency compression driver mounted on a continuous point of 80 degrees on X50 degree horn.

MD-12是一个高功率的坚固的二分频系统，有一个强劲的12英寸低频驱动器和一个1英寸高频压缩驱动器安装在一个持续指向性80度X50度号角上。

We started with a powerful 12", long-excursion low frequency driver for abundant bass punch and accurate low midrange. Next we joined a high-resolution 1" HF driver for clarity and brilliance with a groundbreaking horn design, ensuring smooth frequency response and ultra-wide sound dispersion so you can move around the stage.

这款产品配有功率强大的 12 英寸长冲程低频驱动器，提供铿锵有力的低音和精准的中低频；高解析度 1 英寸高频驱动器和设计新颖的号筒，提供明亮通透的高音，确保平滑的频率响应和极大的声音扩散角度，使你能在舞台上自由跑动。

Moreover, the IGBT radio frequency amplification phenomena, can become relevant if the driver circuit generates high frequency conducted noise components, that can be transferred to the final stage and amplified, generating very high EMI levels.

此外，如果驱动电路产生的高频传导噪音被放大传递到末级，相应的IGBT射频放大现象可以产生更高的EMI。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。