hf的例句大全

Discussion on blocked mode operation logic localization of American SEL-321 microprocessor based HF protection for transmission line

美国SEL-321线路微机高频保护闭锁式动作逻辑国产化初探

Detailed petrologic, geochemical and Sr-Nd-Hf-U-Pb isotopic researches indicate that the Wuping granitic complex consist mainly of biotite granite and garnet-bearing granite with different formation age and petrogenesis.

岩石学、元素地球化学和Sr-Nd-Hf-U-Pb同位素的综合研究显示，武平花岗质杂岩体是由形成时代和成因不同的黑云母花岗岩和含石榴子石花岗岩组成。

HF pipe welding with no inside welding beading

无内焊瘤高频焊管

Absorption of HF may cause hypocalcemia due to HF's fixation of blood calcium.

HF的吸收会由于HF对血钙固定导致低血钙症.

As loudspeaker radiation varies according to frequency, LF and HF drivers have intrinsically different radiation patterns whose directivity-known as'Q'-changes at the crossover frequency.

由于音箱的辐射因频率的不同而不同，因此低频和高频驱动单元具有本质不同的辐射模式，其方向性，也就是常说的“Q”，在交叉频率处发生变化。

The passive crossover network features a thermal protection system on the HF section providing audibly transparent protection for the compression driver.

被动分频网络功能，对高频提供出声透明的压缩驱动程序保护科热防护系统。

Design of a Novel Automatic Antenna Tuning Coupler in HF Communication

一种新的短波自适应天线调谐器的设计

The geometrical structure of the doubly negative charged closo boron hydride B 15 H 2-15 ( D 3h) was optimized at the HF/ 6-31G level, and its energies and normal mode vibrational frequencies were computed at the same level by using abinitio molecular theory.

利用量子化学从头算方法在HF／6－31G水平上，优化计算了带两个负电荷的封闭型硼烷B15H2－15（D3h）的结构，能量和正则振动频率。

The measurement of HC1 and HF concentration profile in Bremerhaven with high resolution FTIR

用高分辨率FTIR测量不莱梅港地区HCl和HF在大气中的浓度分布

Brier Analysis for the Variation Tendency of HF Transformer Distribution Parameters

浅析高频变压器分布参数的变化趋势

The development of SF-501 transceiver specially used for bypath HF protection and its feature are described in this paper.

介绍了SF－501旁路高频保护专用收发信机的开发研制及特点。

This can used to generate high efficient optical parametric amplification ( OPA ) at desired wavelength in HF.

利用光子晶体光纤的这些特性可实现在所需波长上的高效率的参量放大.

Development of Special Tools for HF-4 NC Boring and Milling Machines

HF-4数控铣镗床专用工具的研制

After 5 hours, the sheep in HF group all survived, and 2 sheep of NHF group died.

5h后HF组全部存活，NHF组死亡2只。

The first chapter presents the unique military status of HF.

第一章介绍短波通信的特点和特殊的军事地位。

The details are presented below: 1. The electrical property of Hf-based high k materials.

具体如下：1.Hf基高k材料的电学性质。

Purpose: High frequency low noise amplifier application, HF band amplifier application.

用途: 用于高频低噪声放大, 高频放大.

ACEI improves ventricular function and patient well-being, reduces hospital admission for worsening HF, and increases survival.

它可以改善心室功能,病人预后, 减少心衰恶化再次住院, 提高存活率.

According to the characteristic of HF channel, the Watterson model which was CCIR recommended was made.

首先从短波信道的特性分析入手,建立了基于CCIR建议的Watterson模型 的短波信道模型.

This paper introduces the concept of the HF multitone parallel signal and the technical standard of the 39 tone parallel signal, describes the principle of the 39 tone parallel signal and presents a way to realize the real time demodulation with the TMS320C30/ C31.

本文介绍了短波多音并行信号的概念及39音并行信号的技术规格，论述解调39音并行信号的原理，给出一种用TMS320C30/C31实时解调的实现方法。