what is steam engine?how does it work and how effect is it?
题目
what is steam engine?how does it work and how effect is it?
could somebody help me with this stupid question?please
答案
The steam engine is the steam energy is converted to mechanical work of the reciprocating power machinery.Steam in the steam engine piston according to one or both sides of the work, the role can be d...
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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