at first 都一心学习,首先; 起初,刚开始; 起初,最初; 起初;开始; 起初,首先; 起先,首先; 起先,最初; 起先;开始的时候; 首先,开始的时候; 首先,最初; 首先;起先; 最初,起先; 最初,首先,开始时候; 逍遥自在地
first adj. 1.最初的,最早的。 2.最上等的,第一流的。 3.基本的,概要的。 4.高音(调)的。 Judge not of men and things at first sight. 〔谚语〕对人对事慢评论,初次印象未必真。 the first coat (油漆等的)底涂,底层。 the first impression 最初印象。 the first instance 【法律】初审。 the first snow of the season 初雪。 the first train 头班车。 the first two days = 〔古语〕 the two first days 头两天。 at first hand 直接。 at first sight [blush] 乍看;一见就。 at the first opportunity 一有机会就。 for the first time 第一次。 in the first place [instance] 首先。 on the first fine day 天一晴就。 take the first opportunity 一有机会就。 the F- Commoner 〔英国〕下议院议员。 the first form 〔英国〕(中等学校的)一年级。 the first thing 〔俚语〕首先。 n. 1.最初,第一;第一位。 2.每月的第一日,一号。 3.【音乐】高音部。 4.第一等,头等,优等,甲等; 〔pl.〕一级品。 5.(棒球的)第一垒。 6.【汽车】起码[最慢]速度。 get [take] a first 考第一。 come in first 跑第一。 May (the) first = the first of May 五月一日。 at (the) first 首先。 be the first to (do) 最先…的。 from first to last 自始至终。 from the first 从头,自始。 the F- 〔英国〕九月一号〔鹧鸪开猎日〕。 adv. 1.第一,最初,首先。 2.宁可。 safety first 安全第一。 F- come, first served. 〔谚语〕先到先招待。 stand first 站在最前面。 He said he would die first. 他说他宁愿死掉(也不作那样的事)。 first and foremost 首先,第一。 first and last 总的说来。 first, midst and last 彻头彻尾,始终,一贯。 first, last and all the time 〔美国〕始终一贯,绝对。 first of all 第一,首先。 first off 首先。 first or last 〔古、罕〕早晚,迟早。
In other coordinates it will involve second and possibly first derivatives with respect to time . 在别的坐标系中,它除了包含对时间的二阶微商外,还可能会包含对时间的一阶微商。
Determination of sparfloxacin in tablets by the first derivative spectrophotometry 一阶导数分光光度法测定片剂中司帕沙星
A mark used as a superscript to indicate the first derivative of a variable 撇号置于右上角的符号,用以标明变量的第一个导数
Multiple positive solutions of a semilinear fourth - order boundary value problem with first derivative 含一阶导数的半线性四阶边值问题的多重正解
In chapter two , we put forward an iteration ( 2 . 1 . 1 ) in which the first derivative and the first divided difference are only calculated in each step 1 . 1 )与另两个也仅含一阶导数和一阶差商的算法及两步newton迭代的收敛阶
Bankers and diamond experts are to launch two initiatives in the coming days to create the world ' s first derivatives contracts linked to diamond prices 银行家和钻石专家将在未来数日推出两项举措,以创建全球首批与钻石价格挂钩的衍生品合约。
Bar code recognition is a matter of edge detection , which has long been done through the maximum value of the first derivative or zero crossing of the second derivative 条码识别是一个边缘检测问题。长期以来,边缘检测都是通过一阶导数极大值或二阶导数零交叉进行的。
Combining principal factors scores , a * and first derivative of 555nm reflectance , we discussed modem sediment environment in shelf of the yellow sea and east china sea 结合主因子得分、 a ~ *和re555nm一阶导数的分布,讨论了黄海、东海陆架的现代沉积环境(氧化还原环境) 。
The result indicates that this method is feasible . the first derivative of kinematic parameters can been calculated well while the second ones can ’ t which need filter 其中一阶运动学参数求解效果较好,而二阶运动学参数并不是很理想,掺杂进了高频噪声,需要进行滤波处理。
It is reported in this paper that by using the absorption spectrum of the interfering component as the denominator factor , the first derivative ratio spectra of the component mixture can be obtained , and the inter ference of one of the components can thus be eliminated 利用混合物的波谱除以干扰组分的波谱得比值波谱,对波长求导得比值导数波谱,由此可消除干扰组分的吸光度叠加效应。