查询词典 mathematical expectation

A maneuvering mathematical model for Controllable-Pitch Propeller ships with three degrees of freedom is established according to separate modeling theory. Based on Netherlands Ship Model Basin\'s open-water tests, CPP thrust coefficients and torque coefficients in four-quadrant with different pitch ratio of screw and different types of CPP are obtained by using Akima interpolation. Therefore, CPP thrusts and torques are obtained.

基于船舶操纵性分离建模理论，采用荷兰船模试验水池B系列螺旋桨的敞水试验结果，利用Akima插值获得了不同类型的调距桨在不同螺距比下的四象限推力系数和扭矩系数，求得调距桨的推力和扭矩，建立了调距桨船舶的平面运动数学模型。

According to the Mathematical Marriage Predictor, it's "roll your eyes and say goodbyes."

根据数学婚姻预估，这是&滚你的眼睛说的告别。&

According to the Mathematical Marriage Predictor, it's "roll your eyes and say goodbyes."

根据数学婚姻预估，这是&滚动你的眼睛说告别。&

The mathematical model of plasma arc jet velocity at the exit of orifice logically combines the structural sizes of orifice with the plasma gas flow rate, the temperature of plasma arc at the exit of orifice, intensity of ionization and the force of arc pinch effect, by which the velocity of plasma arc jet can be estimated.

当喷嘴结构参数，离子气流量一定时，等离子弧在喷嘴出口处的温度和电离度的增加能使射流的喷嘴出口速度显著增加，而电磁压缩力使射流的喷嘴出口速度增加得较少。

The purpose of this research is to establish a mathematical model of temperature and humidity for the greenhouses.

良好的设计则要有模式可为依据。

What's more, mathematical applications in real life also depends on may hypothesises! Even the most pure and logical theory of mathematics, like algebra, are based on assumptions.

别老拿现有的已证实的理论来比较未经证实，你知道那些已经被证实的理论在被证实之前是什么样子吗？

I'm not hypothesising any new physics or chemistry, just that we haven't developed the right mathematical tools yet.

我并非对任何新的物理或化学现象进行推测，我们只不过尚未研制出正确的数学工具罢了。

Based on the oxytetracycline production data and with the aid of mathematical statistics method, the dependent factors which affect the antibiotic potency, have been defined.

本文以土霉素生产的实例，应用数理统计方法，找出不同的发酵条件对土霉素发酵单位的影响；同时指出各发酵条件之间的依存关系，定量地找出发酵条件应控制的水平。根据回归方程可以对在不同条件下的发酵单位进行预测和控制，从而有利于发酵单位的提高。

Upon constructing the mathematical model, we once asked for the practical persons' assistance to prevent us from constructing it impractically.

此模式构建期间，曾就教於实际航商规划人员，以免陷於闭门造车之憾。

This paper discusses how to teach students"the product of infinite infinitesimals isn t necessarily infinitesimal" in teaching "advanced mathematics" Or "Mathematical Analysis",and the author provides some new original examples which had not been seen in currently available textbook and riches the teaching content.

文章对&无穷多个无穷小的乘积不一定是无穷小&这一知识点在&高等数学&或&数学分析&的教学中如何讲授给学生进行了一些有益的探讨，并给出了一些在现有教科书及参考书中未曾见过的独创的新例子，从而丰富了教学内容。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。