d라이브러리
"fresh water"(으)로 총 7건 검색되었습니다.
- 강 여행과학동아 l1993년 11호
- Scientists are still looking for ways to clean fresh water systems of PCBs.Dr. Curtis Olsen, with the U.S. ... Bones regurgitated by cormorants living near fresh water we ...
- 모두를 위한 남극과학동아 l1993년 07호
- is also three times higher than any other continent. Its ice represents 70 percent of the world's fresh water, yet its atmosphere is as dry as a desert. And, of course, it is cold - the ...
- 화성에도 물이?과학동아 l1993년 06호
- for scientists, as two new studies will demonstrate.On Earth, water tends to be labeled according to where it is. Surface water includes both fresh (in lakes and rivers) and salin ...
- 과학평론과학동아 l1991년 12호
- that the intimate life of the platypus came to be known. It is an aquatic animal, living in fresh water. The bill of the duckbill is really nothing like a duck's. The nostrils are locate ...
- 가장 깊은 호수과학동아 l1991년 07호
- one-fifth of the entire supply of Earth's fresh water. In fact, it has twice as much fresh water as all five of the Great Lakes put together.It is important, then, to find ...
- 인류최초의 발견─불의 사용과학동아 l1989년 03호
- fire they can never develop even the crudest technology. And fires can't be built in a world of water.When was fire first used? Until the 1980s the oldest traces of fire were detected in caves ...
- 바닷물을 음료수로 만든다과학동아 l1988년 05호
- 간단한 탈염기는 바닷물을 식수로 만들어 주는 편리한 기계. 영국 Sea-Fresh Water System 회사가 만든 이 기계는 시간당 3.5에서 55.5갈론의 음료수를 생산해 낼수있다. 바닷물속에 포함된 염분과 기타 불순물을 역 삼투압 원리에 의해 처리한다. 기계의 본체나 부품은 부식방지재료로 만들어 졌으며 배의 ... ...
