这些就是v的定义，也就是瞬时速度。
那何为瞬时速率呢？
它能在流动的流注中的指定点上监测瞬时速度。
It can monitor the instantaneous velocities at specified points in a flowing stream.
当梯子下耑离墙7英呎时梯子上耑下降的瞬时速度是？
At what rate is the top of the ladder descending at the instant when the lower end is 7ft. away from the wall?
这只是牛顿学上关于动量的表达，用电子质量，乘以瞬时速度。
And this is just a Newtonian expression of momentum, the product of the mass of the electron times its instant velocity.
但德布罗意曾说过，波长是和瞬时速度相联系的，通过这个公式。
But DE Broglie has told us that the wavelength is related to the instant velocity through this formula.
利用积分算法，实现了对瞬时速度、制动距离和制动时间的测量。
Using integral algorithm to realize the computing of braking speed and braking distance and time.
从瞬时速度、脉动速度和平均速度分布等方面对湍流流动进行了分析。
Based on the distribution of instant velocity, fluctuating velocity and average velocity, the flow status of turbulent flow is analyzed.
液压系统动力学振动程度可用瞬时速度、压力和压力脉动描述其特性。
The dynamic vibration of hydraulic system is characteristic of instantaneous velocity, pressure and its oscillation.
设计了一套采用光电开关测量高速列车进出隧道瞬时速度的实验装置。
An experimental unit for measuring instantaneous speed of high speed train passing through tunnel with a photoelectrical switch is designed.
另外，还分析了排气孔口瞬时速度的影响因素，对瞬时速度进行了计算。
In addition, the instantaneous velocity is calculated, and its influencing factors are analyzed.
许多研究表明机动车的尾气排放量与车辆的瞬时速度、加速度密切相关。
Many studies have shown that the amounts of vehicle emissions are typically affected by vehicles' instantaneous speeds and acceleration rates.
轧件与轧辊的瞬时速比和楔横轧工艺参数之间存在着十分密切而复杂的联系。
In the rolling procedure of cross wedge rolling, the technological parameters and instantaneous rotational speed ratio of workpiece and roller have intimate and complicated relationship.
依据牛顿第二定律列出运动微分方程序，解方程序并求得计算瞬时速度的公式。
On the basis of Newton's second Law, a motion differential equation has been put forward, by which a formula to calculating instantaneous velocity has been obtained.
对于一定马力的发动机来说，单气缸发动机需要较大的飞轮来保持其瞬时速度的变化。
For an engine of a given horsepower, single cylinder engines require large flywheels to keep the momentary speed variations.
实验结果表明，该同步瞬时速度辨识的方法和控制方案具有良好的速度辨识性能和控制效果。
The results show that the control scheme and identification method are of better speed identification performances and control effects.
现在明白了吗，t时刻，的瞬时速度是怎样定义的，与两时刻间的平均速度相比，瞬时速度并不一样。
And now you will understand how we define the instantaneous velocity at time t which is different from an average velocity between two time intervals.
本文介绍利用双脉冲激光全息术研究柴油机喷雾油束的宏观运动瞬时速度和喷雾粒子的微观运动速度。
This paper presents some experimental results of the instantaneous macro-speed of diesel fuel spray and the micro-speed of droplets in a diesel fuel spray by using double pulse holographic technique.
在其最大瞬时速度的时刻由间歇釜改成连续釜操作，在此条件下釜的生产效率最高，催化剂消耗相对最少。
In which time, the operation can be changed from batch autoclave to continuous one, under this condition the productive efficiency is the highest, the consumption of catalyst the lowest relatively.
此整定原则以正常偏大方式整定电流、电压定值，其目的是在保证保护可靠性的前提下，增大瞬时速断保护的保护范围。
The new principle calculates current and voltage setting values, which are greater than normal values, to increase protection scope under the condition of assured protection reliability.
采用MMA220加速度传感器获取活动时的加速度，通过分段积分的方法获得瞬时速度，再结合加速度进行活动状态判断。
MMA220 was used to catch the signal of acceleration, and the speed of which was obtained by segmental integral, so that the activity state can be deduced.
试验可以得出颗粒三维运动的瞬时速度，初步试验得出颗粒的纵向平均速度遵循对数分布，颗粒速度小于相应水流的运动速度。
The results of preliminary experiments show that the distribution of stream-wise particle velocity follows the log-law, and the particle velocity is lower than the corresponding clean water flow.
介绍了一种发动机无外载功率检测系统的软、硬件设计，利用测频法测量出某一时刻的瞬时速度，并利用最小二乘法求出角加速度。
By the method of frequency measurement, instant rotational speed is measured in the test system, angular acceleration is calculated by using the feature of the MCU with the least square method.
针对铝合金腐蚀平均速率与瞬时速率的差异，根据腐蚀过程中试样横截面的变化与欧姆电阻的对应关系，建立了新的腐蚀速率计算方法。
Based on the relationship between cross section variety and resistance of sample, a new formula was put forward to calculate the instantaneous corrosion rate of aluminum alloy.
针对铝合金腐蚀平均速率与瞬时速率的差异，根据腐蚀过程中试样横截面的变化与欧姆电阻的对应关系，建立了新的腐蚀速率计算方法。
WT5BZ Based on the relationship between cross section variety and resistance of sample, a new formula was put forward to calculate the instantaneous corrosion rate of aluminum alloy.
利用IFA300型二维恒温热线风速仪系统对双旋流气体燃烧器模型的冷态流场进行了实验研究，测量了流场内不同位置瞬时速度分布及湍流强度特性。
An experimental study was conducted of the cold-state flow field of a dual swirl gas burner model through the use of an IFA300 type two-dimensional constant-temperature hot-wire anemometer system.
建立了一种基于视觉位姿的机器人视觉伺服系统，该系统通过检测目标的位姿状态，从而实时监控和跟踪运动目标，实现对运动目标的相对距离和瞬时速度的动态检测。
A new method of visual location of mobile robot is put forward, and it can measure the relative distance between the mobile robot and goal by objective image.
斯特里克林拉动弹射拉手的那一刻，飞机离地面就只剩下140英尺（约42.7米，14层楼高——译者注），其瞬时速度仍达260英里/小时（约116米/秒）仅仅过了几毫秒，也就是斯特里克林真正离开飞机的那一刹那，飞机其实又下降了100英尺。
When Stricklin pulled the handle, his plane was 140 feet off the ground, flying mostly level at 260 mph. In milliseconds, the plane fell another 100 feet before Stricklin actually left it.
在德克萨斯州的狭长地区，当两周前的暴风雪迫使I - 40洲际高速公路关闭时，没有人会想到这一周沙尘暴引起的时速50英里(瞬时风速达70英里)的风会再一次迫使该区域被关闭。
In the Texas Panhandle, when the snow storm two weeks ago closed sections of I-40, no one would think that 50 mile per hour winds (gusts up to 70) would close sections again this week for dust storms.
在德克萨斯州的狭长地区，当两周前的暴风雪迫使I - 40洲际高速公路关闭时，没有人会想到这一周沙尘暴引起的时速50英里(瞬时风速达70英里)的风会再一次迫使该区域被关闭。
In the Texas Panhandle, when the snow storm two weeks ago closed sections of I-40, no one would think that 50 mile per hour winds (gusts up to 70) would close sections again this week for dust storms.
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