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简述低温腐蚀的机理？

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参考答案：

燃料中的硫燃烧产生二氧化硫其中一部分进一步氧化变为三氧化硫，他在低温部位和水蒸气作用下凝聚成H2SO4，使受热面管子发生严重的酸腐蚀。

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A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hyperlinks-there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

（74）处填（）。

A．Web browser’s

B．terminal’s

C．emulator’s

D．network’s
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问答题 简答题

何谓煤粉细度？
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