quantity n. 1.量 (opp. quality); 分量,数量;额;【物理学】值,参量。 2.〔pl.〕大量,大宗,大批,许多。 3.定量,定额。 4.【数学】量;表示量的数字[符号];【逻辑学】(名词、特别是命题主语的)量。 5.【音韵学】音节的长短;表示音节长短的符号;【语音】(元[母]、音节等的)音量。 6.【法律】期限。 a known quantity 已知数。 an unknown quantity 未知数;〔比喻〕难预测的人[物]。 a negligible quantity 可忽略的量;〔比喻〕无足轻重的人〔物〕;可忽略的因素。 a quantity of 一些。 in quantities 大量。 in quantity 很多。
variable adj. 1.易变的,变化无常的,无定的 (opp. constant, steady)。 2.可变的,能变的;变换的。 3.【数学】变量的;【天文学】变光的;【生物学】变异的。 Prices are variable according to the exchanges. 物价跟着汇率变动。 a man of variable character 反复无常的人。 a rod of variable length (伸缩)如意棒。 a word of variable construction 可以作种种解释的词。 variable capital 可变资本。 a variable budget 临时预算。 n. 1.易变的东西。 2.【数学】变量,变数,变项,变元 (opp. constant);【天文学】变星 (=variable star);【航海】(方向不定的)变风,不定风 (opp. trade wind); 〔pl.〕 (贸易风带中的)变风带。 adv. -ably ,-ness n.
He now called a variable quantity a fluent . 他现在把变量叫做流。
He now called a variable quantity a fluent and its rate of change, the fluxion . 他现在把变量叫做流,变量的变化率叫做流数。
How to vary the two variable quantity of the buck - boost basic circuit on the high frequency switching and whether or not their varying laws are fit for their theoretical conclusion 高频开关下的buck - boost电路中各个变量的动态变化如何,其变化规律是否与理论上的推导一致。
Secondly , agreement between the result from the mentioned eigenvalue arithmetic and the result from numerical calculation in the airfoil differential equation with runge - kutta method which obtain the trend of physical variable quantity demonstrate the fact that the assumed model and the given equations are valid 其次,通过用龙格?库塔的数值方法对微分方程进行迭代,所求出的系统各振动量变化规律和上述算例的特征值对比,结果是一致的。这就验证了建模的合理性和方程推导的正确性。
The slope geometry is variable quantities , and the reliable safety and reliability are main limiting factors . according to the above factors , a optimized model for designing high loess slope is established . this model ' s concept is precise , and its physical meaning is confirm , people who do designing work can see this model as a means 最后,为了使边坡设计获得最佳工程效果,本文在崔政权建立的优化公式: c = a + pf ? b的基础上,全面考虑施工造价和风险造价,运用数学原理和优化理论,用费用?效益分析方法,以最小总期望造价为目标函数;以坡型、坡比为设计变量,以安全可靠为主要约束条件,建立了黄土高边坡的优化模型。
At first , buck - boost circuit is detailed analyzed and derived strictly in the theory , and on the base , the current of the inductance and the output voltage are analyzed elaborately . when the input voltage is the ac voltage with the nomal frequency , the two variable quantity are analyzed and some conclusions are concluded by means of equal length separation methods and introducing function methods and derivative - equation methods . and this is the basis of the next proceeding 首先,对buck - boost电路进行了严谨地理论推导,先对buck - boost电路在输入为直流电压时的工作情况进行了分析;在此基础上,对输入为工频交流电压时的电感电流、输出电压作了详细分析,利用等间距离散化方法、引入函数法、微分方程法分别对变量进行了推导和总结,为下一步工作奠定了理论基础。
英文解释
a quantity that can assume any of a set of values 同义词:variable,