2015年職稱(chēng)英語(yǔ)考試歷年真題詳解及全真模擬試卷A級(jí)(理工類(lèi)) 隨書(shū)超值贈(zèng)..
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- 作者：
全國(guó)職稱(chēng)英語(yǔ)考試命題研究中心 編著
- 出版社：
人民郵電出版社
- ISBN：9787115362025
- 出版日期：2014-9-1
-
原價(jià)：
￥39.80元
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圖書(shū)簡(jiǎn)介
第一部分 職稱(chēng)英語(yǔ)考試指南
一、職稱(chēng)英語(yǔ)考試介紹
二、職稱(chēng)英語(yǔ)考試題型分析
三、職稱(chēng)英語(yǔ)應(yīng)試技巧與例題講解
第二部分 職稱(chēng)英語(yǔ)考試歷年真題詳解及全真模擬試卷
2014年職稱(chēng)英語(yǔ)考試真題(理工類(lèi)A級(jí))
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職稱(chēng)英語(yǔ)考試全真模擬試卷四(理工類(lèi)A級(jí))
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職稱(chēng)英語(yǔ)考試全真模擬試卷七(理工類(lèi)A級(jí))
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職稱(chēng)英語(yǔ)考試全真模擬試卷八(理工類(lèi)A級(jí))
參考答案與解析
職稱(chēng)英語(yǔ)考試全真模擬試卷九(理工類(lèi)A級(jí))
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職稱(chēng)英語(yǔ)考試全真模擬試卷十(理工類(lèi)A級(jí))
參考答案與解析
目錄
Europa, one of Jupiter's 63 known moons, looks bright and icy on the surface. But appearances canbedeceiving : Miles within its cracked, frigid shell, Europa probably hides giant pools of liquid water. Wherescientists find liquid water, they hope to find life as well.
Since we can't go diving into Europa's depths just yet, scientists instead have to investigate the moon'ssurface for clues to what lies beneath. In a new study, scientists investigated one group of strange ice patternson Europa and concluded that the formations mark the top of an underground pool that holds as much water asthe U. S. Great Lakes.
Pictures of Europa, which is slightly smaller than Earth's moon, clearly show a tangled, icy mishmash oflines and cracks known as "chaos terrains." These chaotic places cover more than half of Europa. For morethan 10 years, scientists have wondered what causes the formations. The new study suggests that they arisefrom the mixing of vast underground stores of liquid water with icy material near the surface.
For scientists who suspect that Europa also may be hiding life beneath its icy surface, the news about thenew lake is exciting.
"It would be great if these lakes harbored life, " Britney Schmidt, a planetary scientist who worked on thestudy, told Science News, "But even if they didn't, they say that Europa is doing something interesting andactive right now. "
Schmidt, a scientist at the University of Texas at Austin, and her colleagues wanted to know how chaosterrains form. Since they couldn't rocket to Europa to see for themselves, they searched for similar formationshere on Earth. They studied collapsed ice shelves in Antarctica and icy caps on volcanoes in Iceland. Thosefeatures on Earth formed when liquid water mixed with ice. The scientists now suspect something similarmight be happening on Europa : that as water and ice of different temperatures mingle and shift, the surfacefractures. This would explain the jumbled ice sculptures.
"Fracturing catastrophically disrupts the ice in the same way that it causes ice shelves to collapse on Earth, "Schmidt told Science News. She and her team found that the process could be causing chaos terrains to formquickly on Europa.
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