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Scientists Aim to Explore Area of Life 1000 Meter Under the Sea A team of scientists plans to explore a little-known part of the ocean to search for new sea life and to investigate the effects of pollution and climate change. The scientists will enter what they call the "Midnight Zone" of the Indian Ocean. It is an area at a depth of about 1,000 meters below the surface where light does not _____1_____ but life still thrives. The project is expected to begin on March 16 and to last about five weeks. The scientists aim to explore huge underwater mountains also known as seamounts. The scientists involved in the project are part of Nekton, an ocean research group that works with the University of Oxford in Britain. They are working with the Seychelles' and Maldives' governments in an effort to protect ocean areas. Oliver Steeds is the director of the Nekton _____2_____. He told the Associated Press that the area his team will explore is home to many forms of life. "What we do know is that beneath 1,000 meters, there's no light down there, but a lot of animals...are bioluminescent ( 生物发光 ). It's life that _____3_____," he said. Speaking to AP in Barcelona, Spain, Steeds noted that this team was going into an unknown part of the ocean. A submarine unlike any other The Nekton scientists will be using one of the most modern deep sea submarines in the world. It is named Limiting Factor. Last August, the Limiting Factor completed another project: to dive to the deepest point in each of the world's five oceans. That effort was called the Five Deeps Expedition. The deepest of these _____4_____ took the submarine to nearly 11,000 meters below sea level. The Limiting Factor is built to _____5_____ the huge pressure that exists in the ocean's deepest places. The compartment ( 隔层 ) for the crew of two people is surrounded by titanium ( 钛 ) nine centimeters _____6_____. The submarine also carries enough _____7_____ oxygen for up to 96 hours. Robert McCallum is the leader of the expedition. He said vehicles that can dive deep into the ocean are rare. The scientists will use sensors and mapping technology to identify new species and _____8_____ deep beneath the sea. But, they also want to observe the effects humans have on the deep sea environment. They will be trying to measure the _____9_____ of plastic pollution and possible effects of climate change. Limiting Factor crew already have seen evidence that pollution is affecting places considered _____10_____ . In May, they saw a plastic bag at the bottom of the Mariana Trench, the deepest point in the world's oceans. Dan Laffoley is a marine expert for the International Union for Conservation of Nature, a group based in Switzerland ( 瑞士 ). He said exploration of the Earth's living space is extremely important. He added, "...over 90 percent of that living space is in the ocean and most of that ocean is unexplored." Laffoley said it is urgent, during a time of change, "...that we get people down there, we get eyes in the ocean and we see what's happening." The Nekton scientists will combine their observations with an earlier study of the deep Indian Ocean last year. They plan to present their findings in 2022.
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【简答题】Okumura-Hata模型应用在()MHz频段,cost231-Hata模型应用在()MHz频段,他们的小区半径适用范围为()km。这两个模型在公式上的不同是()项和()项的系数。
【单选题】某教育实验有 A 、 B 两个因素,其中因素 A 有两个水平,因素 B 有三个水平,可以称为什么实验设计? ---- ( )
A.
2*2
B.
2*3
C.
3*3
D.
2*2*3
【多选题】Okumura-Hata模型的适用条件有()
A.
频率为150~1500MHz
B.
基站天线有效高度为30~200米
C.
移动台天线高度为1~10米
D.
通信距离为0~35km
【多选题】供料站中零件类型有哪些?
A.
黑色塑料件
B.
白色塑料件
C.
金属件
D.
黄色塑料件
【单选题】有A、B两个因素,其中A有两个水平,B有三个水平,可以称其为()设计
A.
2×3
B.
2×2×2
C.
3×3
D.
3×3×3
【判断题】如果要查找工程技术类的文献,收录文献全且权威的是EI
A.
正确
B.
错误
【单选题】真空泵的进口真空度为90kPa,当地大气压为100kPa,则该真空泵的压缩比为( )
A.
9:10
B.
1:10
C.
10:9
D.
10:1
【单选题】在一项心理学研究中,自变量有 A 、 B 两个因素,其中 A 有两个水平, B 有三个水平,可以称其为() 设计。
A.
2 ⅹ 3
B.
2 ⅹ 2 ⅹ 2
C.
3 ⅹ 3
D.
3 ⅹ 3 ⅹ 3
【判断题】两因素A、B试验,A有3水平,B有4水平,其中,A1B4要安排两个小区进行试验。
A.
正确
B.
错误
【单选题】有A、B两个因素,其中A有两个水平,B有三个水平,可以称其为什么设计?
A.
2×3设计
B.
2×2×2设计
C.
3×3设计
D.
3×3×3设计
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