查询词典 F.

Suppose Y is an absolutely continuous random variable symmetric about 0 with probability density function f and cumulative distribution function F.

假设Y是一绝对连续且对称於0的随机变数，其机率密度函数为f，而分布函数为F。

It was found that for large aperture ratios (the ratio of focal length of the primary to its aperture, as the f-ratio in modern cameras for instance), f/10 or more, the difference between spherical and paraboloidal mirrors was negligible in the performance of the telescope.

结果发现，大口径的比例（比例焦距初级到其孔径，由于架F -比率在现代相机举例来说）， f/10或更长时间，之间的差别球面和抛物面反射镜是微不足道的，在表现望远镜。

The FCT-150, a 6 fluorite triplet apochromat, yields exquisite images at f/7 or even f/5 with its optional focal reducer.

高桥FCT-150，采用6英寸的萤石三片APO物镜，能在f/7时产生高度细节的图象，如果采用减焦镜，能在f/5时实现相同效果。

His book is mathematically demanding, but it boils down to a few key concepts: there is an optimal f for every trade; if you bet less, your risk decreases arithmetically while profit decreases geometrically; if you keep betting more than the optimal f, you are guaranteed to go broke.

他的书用了很多数学计算，但最终总结为以下几点：每笔交易都有完美的 f；如果你赌的少，风险是数字式的减少而利润是几何级的减少；如果你投入的比最完美的 f 多，你肯定会破产。

The "Fantasia in F Minor," the "Barcarolle," the "Polonaise Fantasia,""Ballade in A Flat Major,""Ballade in F Minor," and "Sonata in B Minor" were all products of the relaxed time Chopin enjoyed in the country.

F小调幻想曲》，《威尼斯船歌》，《幻想波罗涅滋舞曲》，《降A大调叙事曲》，《F小调叙事曲》，《B小调奏鸣曲》等都是在南部疗养时创作的。

The "Fantasia in F Minor," the "Barcarolle," the "Polonaise Fantasia,""Ballade in A Flat Major,""Ballade in F Minor,""Sonata in B Minor" were all products of the relaxed time Chopin enjoyed in the country.

F小调幻想曲》，《威尼斯船歌》，《幻想波罗涅滋舞曲》，《降A大调叙事曲》，《F小调叙事曲》，《B小调奏鸣曲》等都是在南部疗养时创作的。

Basanite and tephrite from Mt. Crater, Cape Bird and southern bank of Bonney Lake are considered as a major result of partial melting of equilibrium in the mantle, fusibility f=1. 5-7%, mantle reservior are enriched in LREE and Yb, and latite from Cape Rodeys and Cape Evens as a results of magmatic fractional crystallization, crystallinity F=58. 09-70.72%, its primary magama is almost the same as basanite in study area.

博尼湖南岸、克雷克特山和鸟角碧玄岩是地幔平衡部分熔融作用的产物，地幔部分熔融度f为1.5-7％，地幔源区为轻稀土富集型，并富集重稀土元素Yb；罗德角和伊万思角安粗岩是岩浆分离结晶作用的产物，结晶度F为58.09-70.72％，伊万思角高于罗德角，它们的母岩浆相当于本区的碧玄岩。

Provides for the pitch d, f, a, c, and f-line painted red, c painted yellow line (later to become Zhonggao Yin Staff and the origin of the bass clef). The 13th century was the first use of 5 lines, to become the predecessor of Staff. 16th century and increase the line to make the pitch more complete records.

规定音高为d、f、a、c，并将f线画成红色，c线画成黄色（后成为五线谱中高音及低音谱号的起源）。13世纪有人使用第5根线，成为五线谱的前身。16世纪又有加线的办法，使音高的记载更完备。

Populations inhibitory effect of two kinds of bitter almond oil against Sitophilus zeamais Mots showed that the populations inhibitory effect of F1 and F���is decreased with the decrease of concentration, the populations inhibitory rate of F1 and F���is between 30% and 100%, 29.39% and 58.19% respectively.

种群抑制活性结果表明苦杏仁精油对玉米象F1代以及F′代的种群抑制活性随着处理浓度的降低而逐渐降低，两种处理的苦杏仁精油对玉米象F1代的种群抑制率范围在30%～100%之间，对F′代的种群抑制率范围在29.39%-58.19%之间。

NA, or the amount of contact some of the macro (such as the Faraday constant F, gas constant R, etc.) and micro-volume (such as the elementary charge e, Boltzmann constant k, etc.) of the relationship between a fundamental constant: F = NAe, R = NAk, etc..

NA还是联系某些宏观量（如法拉第常量F，气体常量R等）与微观量（如基本电荷e，玻耳兹曼常量k等）之间关系的一个基本常量：F＝NAe，R＝NAk等。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。