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  1. ... by force which tempts with the promise of gain the method forces...in this field of endeavor for them to serve這些人..服務 2006... duplication sheep... Some two factors ...

    分類:科學 > 其他:科學 2006年02月18日

  2. ... which rely on the principle of thermionic emission can achieve ... than those at which standard RTGs run. => ...potentially doubling efficiency. Some theoretical thermophotovoltaic cell ...

    分類:科學 > 其他:科學 2006年01月03日

  3. ... are all different-sized, some even longer than a human palm. the teeth... edges from the tip to the root, which is proof of its ferocity. Its jaws are...

    分類:科學 > 其他:科學 2005年12月23日

  4. ...will grow out time by time to their size limitation. Mantle... to increase thickness of shell. There are always some scars on the shell which stand for one disaster issue for...

    分類:科學 > 其他:科學 2005年12月15日

  5. .... Usually they travel alone or in small groups of two to four, although off the coast of California some groups as large as...instead of teeth which they use to strain food from...

    分類:科學 > 其他:科學 2005年12月17日

  6. ... They all live near water. Some species of Crane Fly live in the water for part of their lives. Crane... on the end which look like tentacles...

    分類:科學 > 其他:科學 2005年10月23日

  7. ... of soil productivity, which is causing... a widespread byproduct of current practices... present rates, some critical forest types...next century. With them will go large numbers...

    分類:科學 > 其他:科學 2005年08月10日

  8. ... only are environmentalists concerned about the loss of biodiversity which will result from the forest s destruction, they are also concerned about the release of the carbon which is ...

    分類:科學 > 其他:科學 2005年08月01日

  9. ...ant. It has some special tricks forliving...the hot, dry sands of the Sahara, in... part of the day. They come out to huntfor food at...include thepredators, which come out at the same time...

    分類:科學 > 其他:科學 2005年06月18日

  10. ... America their home. He eventually became a citizen of the United ...in X-ray technology, which he pursued on a... published some results on the theoretical...

    分類:科學 > 其他:科學 2005年06月10日