查询词典 F.

Results The minimum latency prolonged and ratio of amplitude of F/M and the ratio of the area of F/M significantly increased in the patients with DPN,the duration of F wave prolonged in the mild DPN but revealed normal in the severe ones.

结果无神经病变的 DM患者 30例， F波时限增宽 8例， F波最短潜伏期延长 4例， F/M波面积增大 2例。

Through identification of all F 1, F 2 and partial BC 1, BC 2 resistance to wheat spindle streak mosaic disease and tracing analysis of F 3, the heritability of resistance to WSSM was studied in the wheat varieties.

本试验选用17个高抗品种、9个高感品种随机组合进行杂交，通过对F 1、F 2和部分BC 1、BC 2的抗感鉴定结果以及F 3代的追踪分析，研究了小麦品种对小麦梭条花叶病的抗性遗传规律。

Taking the active network as a research task, the input accessibility, the Coates graph of matrix and graph transmission etc are used to analyze the relation between reducibility of the coefficient matrix of the state equation and the electric separability of the network or the electric accessibility of the network for the first time, acquiring sufficient and necessary conditions that coefficient matrix of the state equation is reducible. Network Graph Theory, Matrix Theory and System Theory over F etc are used to derive the structural controllability criterion of the passive network over F for the first time. Then according to these theoretic results, the structural controllability problems of the active network over F are studied, acquiring several structural controllability conclusions of the active network.

率先将状态方程的输入可达、矩阵的Coates图、流图传输系数等概念和方法引入到对F上有源电网络的研究，研究了网络状态方程的系数矩阵的可约性与网络电气可断性或电气可达之间的关系，研究了F上有源电网络的能控性问题，获得了状态方程的系数矩阵可约的充分必要条件、F上有源电网络系统的结构能控性判据等新的结论。

According to condition of phase resonance of fiber grating F-P cavity, the relationship between fiber Bragg grating period and cavity length for fiber grating F-P cavity has been deduced, which provide a basis for the manufacture of the F-P filter based on fiber Bragg grating.

根据光纤Bragg光栅F-P腔的相位谐振条件，推导了光纤光栅F-P腔的腔长与光纤Bragg光栅常数之间的关系，从而为研制基于光纤Bragg光栅的F-P滤波器提供了依据。

If we ever find anything missing in the F-22 that we have in the F-15 or in the F-16, we are going squawk a little.

如果我们发现什么功能在F-15或F-16上有而在F-22上没有，我们就会提出一些抗议。

Thus, the thermodynamic properties of water in wood were expressed as F= F 1+ F 2.

因此，木材中水分的热力学量也可以表达为： F= F 1+ F 2。

And this causes a frequency change Δf. The resonant point tracing algorithm describes how to detect Δf. So it can introduce a feedback frequencydifference -Δf through a closed loop to realize the resonant state o In the digitaldetection scenario, using staircase wave to replace saw tooth wave, it can overcome a lot of shortcomings in the analog system. The character of the staircase wave affects the detection precision directly. This thesis analyzes a high precision scenario producing a staircase waveform in detail. It can reduce the number of the bits in D/A converter greatly. This thesis proposes another method to improve the detection precision in case that the A/D converter has comparatively little number of bits, while this method will not increase the cost of the system greatly.

在谐振式光纤陀螺中，环形谐振腔的旋转使得谐振腔的谐振频率发生了变化，从而产生了一个与旋转速度成正比的频率变化值△f，谐振点跟踪算法描述了如何检测出△f，从而可以通过闭环在系统中引入反馈频差-△f，实现光路的谐振状态；在数字闭环检测方案中，用阶梯波作为反馈信号来代替锯齿波，可以克服原来模拟系统中锯齿波的很多缺点，阶梯波的性能直接影响着系统的测量精度，本论文详细分析了一种高精度阶梯波生成方案，使得所需D／A的位数大大降低；本文还分析了A／D转换器对系统测量精度的影响，提出了一种A／D转换器位数较少的情况下提高系统测量精度的措施，同时又不会增加太多的系统成本。

The model/L=f(a(1-ε)/(ε~3)u~2 coulddepict the overland flow in the litters, there f" was a undetermined coefficient, when the flowvelocity was very low, the Ergun equation f"=(4.17)/+0.29 could depict the overland flow.

坡面流在枯落物中流动的数学模型，可用下述模型描述hf/L=f"a(1-ε_ε3u2，其中包括一个未知的待定系数f"，在流速较低时，可用欧根方程描述：f=4.17/Re+0.29。

The addition of F-/AcO- to 2 was further confirmed by monitoring the changes in its 1H NMR spectra in the presence of either F- or AcO-(Figure 3). Four peaks of acridinium of 2 showed pronounced upfield shifts due to the conversion of acridinium to acridane in 5 equiv of either F-(Figure 3b) or AcO-(Figure 3c).

F－/AcO－添加到2中通过监测其在存在F－或AcO－时H NMR谱的变化进一步得到确认（图3）。2的吖啶盐的四个峰值证明了由于在5个当量F－（图3b）或AcO－（图3c）中吖啶盐转化成吖啶而引起的明显的高场位移。

I've seen articles in Air Progress that show how the F-15 will turn so much better than the F-16 because the F-15's wing loading is lower.

我曾经看到《航空发展》上的一篇文章解释为什么F-15的转弯性能要比F-16好的多，因为F-15的翼载荷要小的多。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。