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While working in South Africa, Ken Banks saw that many of these communities did not have1., so communication was a challenge. However, Banks noticed that many villages had2..Banks created 3.called Frontline SMS, which was installed on a computer, which was then connected to a cell phone, allowing people to communicate through4.Today, Frontline SMS is used worldwide. According to Banks, 5.is to take your idea and make it reality.

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回收汽轮机轴封蒸汽的热量的设备是()。

A. 低压加热器
B. 高压加热器
C. 除氧器
D. 轴封蒸汽冷却器

在无疏水冷却段的情况下,疏水的出口温度()蒸汽侧压力下的饱和温度。

A. >
B. <
C. =
D. 不确定

下列哪那个是混合式加热器的优点。

A. 没有端差
B. 可以汇集各种不同参数的汽
C. 可以作为除氧器使用
D. 全部为混合式加热器的回热系统简单,安全性高

下列哪那个是表面式加热器的优点。

A. 管内水的出口温度与疏水的温度一致
B. 全部由表面式加热器组成的回热系统简单
C. 运行可靠,布置方面,系统投资少
D. 能够除去水中的氧气机其他气体

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