[請益] TPO6 Powering the industrial revolution

看板TOEFL_iBT (TOEFL_iBT托福)作者snipeking (狙擊王)時間15年前 (2010/11/20 17:08)推噓3(3推 0噓 4→)

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The source had long been known but not exploited. Early in the century, a pump had come into use in which expanding steam raised a piston in a cylinder, and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum．This "atmospheric engine,” invented by Thomas Savery and vastly improved by his partner Thomas Newcomen, embodied revolutionary principles, but it was so slow and wasteful of fuel that it could not be employed outside the coal mines for which it had been designed. In the 1760s, James Watt perfected a separate condenser for the steam, so that the cylinder did not have to be cooled at every stroke; then he devised a way to make the piston turn a wheel and thus convert reciprocating (back and forth) motion into rotary motion. He thereby transformed an inefficient pump of limited use into a steam engine of a thousand uses. The final step came when steam was introduced into the cylinder to drive the piston backward as well as forward thereby increasing the speed of the engine and cutting its fuel consumption. 6. According to paragraph 2, Watt's steam engine differed from earlier steam engines, in each of the following ways, except: 1.It used steam to move a piston in a cylinder. 2.It worked with greater speed. 3.It was more efficient in its use of fuel. 4.It could be used in many different ways. 答案是1 但是我找不到在文中哪裡有明確的點我選只是因為另外三點都有提到是我有漏掉什麼嗎我覺得唯一有關連的只有James Watt perfected a separate condenser for the steam, so that the cylinder did not have to be cooled at every stroke 但是condenser跟piston在文中並不有說是相等的所以我覺得好怪一一a -- ◢ ≡ ◣ ╭──────────╮ ⊙-⊙◥ │戰你媽的死大雄 │ ▃ ≡皿 ≡ ╯再跟拎北哭夭你試試看│ ╭┴╮ ◥ ︶ ◤ ╰──────────╯ │瓦│ ◣▇▇▇◣ │斯│ ▽ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.168.13.14