FB 2

For most calciners, their index of combustion condition Fb all are lower than-2.3, It means that the pulverized coal combustion in calciners is mostly decided by reactivity of coal.

对于大多数分解炉来说，其煤粉的燃烧状态指数Fb均小于-2.3，属于动力控制区，即分解炉中煤粉燃烧的状态主要取决于煤的反应活性。

Behind the app was Mr. D'Aloisio, who taught himself how to create computer programs at age 12, and previously created several apps, including Facemood, which analyzed a person's Facebook FB-2.33% account to determine their mood, and a service that helps people discover new music.

软件的幕后英雄是达洛西奥，一位从12岁开始自学计算机编程的少年。他以前也开发了几款应用程序，如分析一个人Facebook账户以判断其心情的Facemood，还有一种帮助人们发现新音乐的应用。

Two kinds of Fe bacteria ( named Fb 1 and Fb 2) were separated from the natural water samples collected from the west district of Jilin province.

从吉林省西部天然水中分离出Fb1和Fb2两种铁细菌。

Facebook ( FB) will become a Google competitor in the advanced vision technology space after its purchase of Oculus VR, which makes virtual reality headgear, for$ 2 billion in March.

Facebook在今年3月以20亿美元收购头戴式虚拟现实技术设备的制造商Oculus VR后，成为了谷歌在先进视觉技术领域的竞争者。