And similarly old crystal radio sets and more recently modern radio frequency identification (RFID) tags, increasingly used in shipping and as antitheft devices, are powered purely by radiowaves.
同样，老式晶体管收音机，以及日益普及于航运及防盗装置上的，更新式的现代无线射频识别技术(RFID)，都是仅仅从无线电波中获取能量。
Parents were quizzed about the types and frequency of the food and drink their children consumed when they were three, four, seven and eight and a half years old.
在这些儿童三岁、四岁、七岁和八岁半时，研究人员向孩子的父母询问了孩子所摄入的饮食的种类，以及隔多长时间进食。
Parents were quizzed about the types and frequency of the food and drink their children consumed when they were three, four, seven and eight and a half years old. They were marked on a.
在这些儿童三岁、四岁、七岁和八岁半时，研究人员向孩子的父母询问了孩子所摄入的饮食的种类，以及隔多长时间进食。
To conquer the old wavelet inherent shortcoming, a combine wavelet is designed and used to realize the accurate detection to harmonic contents and frequency of power quality transient signals.
为了克服小波固有的缺陷，本文构造了一种组合小波，并利用它实现了对电力暂态谐波信号含量及频率的准确检测。
It USES Radio Frequency technology, instead of old local area network with twisted-pair copper wire, and makes the wireless local area network use simple architecture which allows users to access.
它利用射频的技术，取代旧式的双绞铜线所构成的局域网络，使得无线局域网络能利用简单的存取架构让用户透过。
The paper, from the point of view of energy saving, explains the economic gain available by applying the frequency transformation speed regulation technique in renovation jobs of fans of old sets.
该文从节能角度阐述了老机组风机改造中应用变频调速技术的经济效益。
To the old age woman which attends the experiment carries on 3month-long observations, guarantees the trying practice time, the frequency, the intensity.
并对参加实验的中老年妇女进行3个月的观察，以保证受试者的练习时间、频率、强度。
Results There was no significant difference between the two groups with regard to motor frequency, but the rate of mistake in the old group was significantly higher than that in the young group.
结果两组间的运动频率无明显差异，但中老年组的错误率显著高于青年组。
Improvement to the old method formulated in this paper mainly lies in the combination of phase displacement method with frequency two-dimensional filtering in making operation.
本文对原方法的主要改进点是把相位移法与频率域二维滤波结合在一起进行运算。
A new signal source for electric impedance tomography system is developed to improve the high-frequency performance and to reduce the noise level of the old one.
目的研制用于电阻抗断层成像系统的信号源，提高现有系统的高频特性，同时降低其噪声水平。
In the MTF measurement, the object is slant edge, compared with old edge measurement, it has no Angle adjustment device, and improved sampling frequency.
调制传递函数的测量中，采用倾斜刀口作为分析对象，与传统的竖直刀口采样相比，省掉了角度调整装置，并且提高了采样频率。
The product host circuit has adopt the IGBT component, has complied with fundamental lattice new being old characteristic generation high frequency equipment with shell electron tube Bo.
本产品主电路采用IGBT器件，从根本上格新了以玻壳电子管为特征的老一代高频设备。
Flower for the halo for old eyes, multi-frequency phase ashamed ape Crane asked.
老眼作花花作晕，多惭猿鹤频相问。
Parents were quizzed about the types and frequency of the food and drink their children consumed when they were three four seven and eight and a half years old.
在这些儿童三岁、四岁、七岁和八岁半时，研究人员向孩子的父母询问了孩子所摄入的饮食的种类，以及隔多长时间进食。
Parentss were quizzed about the types and frequency of the food and drink their children consumed when they were three, four, seven and eight and a half years old.
在这些儿童三岁、四岁、七岁和八岁半时，研究人员向孩子的父母询问了孩子所摄入的饮食的种类，以及隔多长时间进食。
The frequency of errors in grammar and punctuation has become a serious concern, the State Examination Commission said in a report after reviewing last year's exam performance by 15-year-old.
爱尔兰国家考试委员会在针对去年15岁学生考试成绩的评论报告中称，语法和标点错误频频出现，已成为一个严重的问题。
Results 15-year-old group is significantly higher than 12-year-old group in gingival bleeding detection frequency; dental calculus detection frequency and average section count.
结果：两个年龄组的牙龈出血检出率、牙石检出率以及牙石平均区段数，15岁年龄组明显高于12岁年龄组。
Results 15-year-old group is significantly higher than 12-year-old group in gingival bleeding detection frequency; dental calculus detection frequency and average section count.
结果：两个年龄组的牙龈出血检出率、牙石检出率以及牙石平均区段数，15岁年龄组明显高于12岁年龄组。
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