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1·Fluorine is an important chemical element.

氟是一种重要的化学元素。youdao

2·Fluorine has many uses in daily life.

氟在日常生活中有很多用途。youdao

3·Toothpaste usually contains Fluorine.

牙膏里通常含有氟。youdao

4·Fluorine helps protect teeth.

氟有助于保护牙齿。youdao

5·Fluorine has very active chemical properties.

氟的化学性质很活泼。youdao

6·We need to understand the characteristics of Fluorine.

我们需要了解氟的特性。youdao

7·Fluorine is widely used in industry.

氟在工业上有广泛应用。youdao

8·Fluorine - containing products are very popular.

含氟的产品很受欢迎。youdao

9·Fluorine is beneficial to human health.

氟对人体健康有益。youdao

10·The Fluorine element exists in nature.

氟元素存在于大自然中。youdao

氟

1·So, we can say that -- if we have neon here and we want to think about what's isoelectronic, -- f minus would be isoelectronic. We also have oxygen -- what would the charge on oxygen be?

那么，我们可以说--如果我们这里有氖原子,而我们想知道与它等电子的是什么，负一价的氟离子就是与它等电子的，我们还有氧-,氧应该是几价的？

2·A halogen element, f, is major raw materials deriving fluorine compound, and because of low melting point, that is widely used in steelmaking, nonferrous metal smelting, cement, glass and ceramics.

萤石中含有卤族元素氟，是制取含氟化合物的主要原料，又由于熔点低而广泛用于炼钢、有色金属冶炼、水泥、玻璃、陶瓷。

3·Control on harmful elements such as K, Na, f, s in smelting is short of effective measures, which results in BF capacity factor low, BF process not smoothly and serious environment pollution.

对冶炼中有害元素钾、钠、氟、硫的控制还缺乏有效手段，致使出现高炉利用系数偏低、高炉不畅和造成环境的严重污染。

4·And the unloadings from the factories cause great detriment of superposed F pollution.

工厂排污导致的叠加氟污染危害较大，应引起重视。

5·Results Along with different experiments the dissolutions of F and Al presented respective characteristics.

结果茶中氟和铝随冲泡次数、温度、时间、茶水比的不同呈现各自的溶出特性；

华氏的

1·A mathematical model finds that a temperature of about 98.6 F is high enough to ward off the majority of fungal infections, but still low enough to only require a manageable level of food intake.

一种数学模型发现98.6华氏度的体温，对抵御绝大多数微生物的感染，已经足够了； 而对于将食物吸收维持在一个可控水平上，也足够低。

2·NASA just announced five science experiments that will fly on the scorching probe, which will be protected by a carbon-fiber heat shield that can withstand temperatures of 2, 500 degrees f.

NASA已经宣布将在这个“超级火热”的航空器中进行5项科学实验。航空器将得到表面的碳纤维材料层的保护，这个保护层能够忍受华氏2500度的高温。

3·It can heat up the surrounding air to 55, 000f - five times hotter than the surface of the Sun.

它可以把周围的空气加热到55000华氏度，热度比太阳的表面还要高5倍。

4·NASA just announced five science experiments that will fly on the scorching probe, which will be protected by a carbon-fiber heat shield that can withstand temperatures of 2,500 degrees F.

NASA已经宣布将在这个超级火热的航空器中进行5项科学实验。 航空器将得到表面的碳纤维材料层的保护,这个保护层能够忍受华氏2500度的高温。

5·The marathon was run on a very humid, 90f degree day.

马拉松比赛当天湿度很大，气温高达90华氏度。

(1)f value振子强度

(1)f test方差齐性检验

(1)f ration. 方差比；F值

(1)f layern. 电离层