塑膠中的化學(xué)物質(zhì) (1)
- 相關(guān)熱點(diǎn):
- 英語專四常見詞辨析
科學(xué)60秒:X光——透射生活的美好
X-rays are so common today you probably never stop to think about them. They help check a broken wrist, a sprained ankle, the state of our teeth. But a little more than a century ago, x-ray machi
科學(xué)60秒:歐洲祖先原來很晚才學(xué)會(huì)生火的
Imagine life without fire. A lot of huddling for warmth. The ___1___ was that humans could make and control fire when they first migrated north to colder Europe, about a million years ago. But n...
尼日爾士兵發(fā)動(dòng)政變推翻總統(tǒng)
尼日爾士兵發(fā)動(dòng)政變推翻總統(tǒng) Hints:Tandja,Colonel Abdoul Karim Goukoye Karimou,NigerIn a nationwide radio and television broadcast, a spokesman for the mutinous soldiers said they have suspended...
鼓起勇氣
Summon up Courage:鼓起勇氣docile:溫順的ditch溝,壕溝There were two men who both decided to get a horse for riding .One man found a red horse with much spirit while the other chose one more docil...