pfd
美英
- 网络工艺流程图(process flow diagram)；鉴频鉴相器(Phase Frequency Detector)；主飞行显示器(Primary Flight Display)
pfdpfd
工艺流程图(process flow diagram)
根据工艺流程图(PFD)的要求，详细地表示该系统的全部设备、仪表、管道、阀门和其他有关公用工程系统。 P&ID 的表达重点 …
鉴频鉴相器(Phase Frequency Detector)
鉴频鉴相器(PFD)：从参考信号和反馈信号中产生相位误差信号。电荷泵：将误差信号转换为与相位误差成比例的正/负电流脉 …
主飞行显示器(Primary Flight Display)
在主飞行显示器(PFD)上用绿色圆圈指示的绿点速度表示的是最佳升阻比速度,该时的空气动力效率是最大的.结果,对于所飞过的 …
程序流程图(program flow diagram)
同问程序流程图（PFD）中的箭头代表什么？ 2007-08-28 11:09 提问者： 心之蓝心 | 来自手机知道 我来帮他解答
频率检测器(Programmable Frequency Divider)
和一个反馈时钟，相位频率检测器（PFD）产生一个上升或下降信号，决定VCO是否需要工作在较高或较低的频率，PFD输出 …
1
Or at least can create PFD such a way that before conversion to PDF user will not see RTF file.
或者至少可以创建PFD的这样一种方式，在转换为PDF的用户将无法看到RTF文件。
2
To the right of that light, above and between the PFD and ND, are two knobs; these control what systems are linked to the pilot's displays.
灯的右边，PFD和ND上方中间的位置有两个旋钮；它们用来控制正驾驶显示器显示的系统信息。
3
The average probability of failure on demand is the main basis used to determine the safety integrity level of safety instrumented systems.
安全仪表系统在一段时间内要求时失效概率的平均值PFD（avg）是评判其安全完整性水平SIL的主要依据。
4
The top one is the standby flight display -- it looks just like the regular PFD.
上面一个是备用飞行显示器——看上去和常规的PFD一样。
5
Principle Control Loops shall also be shown in the PFD.
原理控制回路也应显示在PFD。
6
PFD can occur as a result of injury through strenuous activities like Pilates, biking, and horseback riding.
PFD可能由繁重的运动——如普拉提、骑单车和骑马等引起的肌肉损伤所导致。
7
The two main displays in front of the pilot are the PFD (primary flight display; left) and ND (navigational display; right).
正驾驶面前的两块显示屏分别是PFD（主飞行显示屏；左侧）和ND（导航显示屏；右侧）。
8
The top-of-the- line vest for whitewater rafting makes an excellent PFD for river rescue.
乘筏航行水银的线在顶的背心对于在河上拯救是极好的PFD。
9
of Phase Frequency Detector (PFD) and modifying the rest of the PLL blocks.
相位频率检测器（PFD）和修改其他的PLL模块。
10
In the event that the PFD fails, the pilot can still get critical flight information from these backup instruments.
当PFD失灵时，飞行员仍可在这些备用设备上读取关键的飞行信息。
11
When the PFD does not generate pulses in lock mode, the charge pump does not provide charge to the loop filter.
当PFD在锁定模式中不生成脉冲时，电荷泵不提供电荷给环路滤波器。
12
Conclusion Trace PFD exists in eyes. There is no relevance between poisonous development of retina and remaining dosage of PFD.
结论：微量PFD存在于眼内，视网膜毒性发展进程与PFD的残留剂量无关联；
13
Similar in design to the Stearns SAR Vest PFD, the "Mesh" PFD provides added comfort in warm weather conditions.
相似的设计于StearnsSARVestPFD，“网眼”PFD提供加进温暖天气舒适。
14
Research Design & Methods: Women were screened for PFD using a validated mailed survey.
方法和设计：妇女先通过一个有效的邮件形式的调查进行筛检。
15
To the left of the pilot's PFD is a digital clock with count up timer and sweep second hand.
正驾驶PFD左边的是一个配有正数计时器和秒针的数字钟。
16
Prepare detailed PFD, P&ID, plant layout, equipment list and control philosophy.
准备详细的工艺流程图、管道仪表图、系统平面图、设备清单和控制逻辑。
17
The dead zone of the PFD is eliminated by adding delay cells in the reset path.
通过在重置反馈路径上加入延迟单元的方法来消除鉴相器的死区。
18
This paper presents a discrete Markov model for analyzing the PFD(avg).
该文提出了一种采用离散Markov模型定量计算PFD（avg）的有效方法。
19
There is one little light above the PFD; this is a warning light that tells the pilot when that the below-glidesope alert is active.
PFD上方有一盏小灯；这是盏警示灯，当低于下滑道警告响起时，它会亮起。
20
I also need a pfd copy of the same.
我还需要一个同样PFD的副本。