4-level frequency modulation (4-level FM)

Its RF modulate level has great effect on nonlinear distortion of the LASER export light wave.

作为有线电视网络的核心传输设备,直接调制光发射机的射频调制电平影响到激光器输出光波的非线性失真,光接收机的射频输出的调试影响到HFC双向网络的回传通道的性能,探讨光发射机和光接收机的调试原理和具体应用,以提高网络的传输性能。

Aimed at the requirement of 4-axis synchronization hydraulic servo machine,a PID+Fuzzy combined control arithmetic based on PLC was presented.

针对液压机四角调平控制的要求,提出一种基于PLC的PID+模糊控制的复合算法,其中模糊控制器和PID调节器都通过PLC来实现,这样既保留PLC控制系统控制灵活、可靠、抗干扰能力强等特点,又大大提高了控制系统的智能化程度。

The author analyses its historical sources, shaping and development of the SiPing Diao Drama through some historical da.

本文从四平调剧种的渊源与流变,唱腔音乐特点与结构及演唱风格三方面对这一20世纪40年代才搬上舞台的年轻剧种,进行了初步的探索与研究。

The Study on Cultural Inheritance of FengXian SiPing Diao Drama

江苏丰县四平调音乐传承的文化考察

Investigate the Team Structure of Health Supervisor in Siping and Suggest the Countermeasures;

四平市卫生监督执法队伍现状调查及对策建议

The Research of Analysis and Synthesis for Planar Four-bar and Five-bar Adjustable Mechanisms;

平面四杆和五杆可调机构分析与综合研究

A Survey on Adult Student Classroom Anxiety;

成教学生在四种英语课堂活动中焦虑水平调查

Some issues on the mining industry structure of Siping City and its reformation;

四平市矿业产业结构调整原则与优化浅析

Intelligent Control of a Four-rope-driven Level-adjustment Device

一种四绳索牵引水平调节吊具的智能控制方法

Quaternary Geological Features of Beijing Piedmont Plain Using 3-D Structural Method

北京山前平原区第四系三维结构调查方法研究

Comparison of voltage shifted modulation technology in four-level diode clamping inverter

四电平二极管箝位逆变器调制方法的比较

Leveling jacks, located at the four corners of the main frame, are controlled from the operator's cab.

位于主机架四角的调平千斤顶是从操作室控制的。

The four main pathological factors that cause disorder of dynamic balance are: adhesion, cicatrix, contracture, and block.

而造成动态平衡失调有四大病理因素，即粘连、痕、缩、塞。

Rates went up this month for the twelfth time, to the highest level in more than four years.

这个月利率已是第12次上调了，达到了四年来的最高水平。

On Tone of Hakka Dialect Spoken in Shangsixiang,Wuping

试论武平东留乡所属上四乡(六个自然村)客家话声调

A SURVEY ON THE GIANT PANDA(AILUROPODA MELANOLEUCA)IN WANGLANG NATURAL RESERVE, PINGWU,NORTHERN SZECHUAN, CHINA

四川省平武县王朗自然保护区大熊猫的初步调查

Survey of the Hakka Dialects Spoken in Shang Si-xiang(Six Villages), Dong-liu Township, Wu-ping Country, Fu-jian Province;

福建省武平县东留乡所属上四乡（六个自然村）客家话调查研究

An Investigation of Lipids Levels and Ankle-brachial Index among Isolated Population in Sichuan Province;

四川攀枝花自然封闭人群血脂水平与踝臂指数的调查研究

The Investigation and Analysis of the Present Situation of the Activity-takers who exercise in the Morning and Evening Exercise Spot in Siping;

四平市晨晚练点锻炼者参加体育活动的现状调查与分析

Investigation and Analaysis on the Teaching Effects of Sports and Health Lesson in Level-4 in Urban China;

我国城镇《体育与健康》水平四学生教学效果的调查与分析

The Contemporary Folk Belief of Manchu--The Second Investment of Folk Belief of Manchu;

满族当代民间信仰——以四平地区为例——满族民间信仰调查之二