单选集
单选集
数列"200、400、200、800、200、400、200、600"的众数是（）。
A:200 B:400 C:600 D:800
QT400-15中的400表示（）。
A:抗拉强度大于400MPa B:抗拉强度小于400MPa C:屈服点大于400MPa D:屈服点小于400MPa
QT400—15中的400表示（）。
A:抗拉强度大于400MPa B:抗拉强度小于400MPa C:屈服点大于400MPa D:屈服点小于400MPa
A:Over 130. B:At least 40. C:About 400. D:Over 3,000.
{{B}}第二篇{{/B}}
| {{B}}? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ?
What is Cold?{{/B}} ? ?How cold is cold? It all depends on who is talking. To us ordinary people nothing in the world maybe so cold as failing through the ice on a frozen lade, or huddling(卷缩)on a windswept ?mountain hoping to be rescued in the dead of winter. Some may even think they are freezing to death when rushing under an ice-cold shower just out of a warm bed. Indeed, we all know what cold means. Arctic(北极) .explorers would laugh at such ideas. Down in the Antarctic(南极), where scientists of many nations spend very dark months living on a sheet of ice two miles thick, the temperature spends most of its time at 50or60 degrees Fahrenheit below ?zero, often with hundred-mile winds and heavy snowstorms. This is the cold that is cold, to them. ? ?Space people have still another standard. The coldest place in which a person can live and survive is some 400 degrees hotter than space itself,". However, the coldest place in earth-colder ?even than space-is inside a machine called a cryostat(低温保持器). Here, scientists and engineers in thousands of laboratories and factories in many parts of the world regularly make cold that turns the South Pole’s worst into a pleasant summer day. They are inching toward such cold that there is no temperature at all-down a frozen valley that leads to Absolute Zero, 459.67 degrees Fahrenheit below our zero of a cold winter’s day. |
A:about --400 °F B:about --350 °F C:about --450 °F D:about --500 °F
A:More than 130 B:Over 3,000 C:About 400 D:At least 40
A:More than 130. B:Over 3,000. C:About 400. D:At least 40.
下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案。
{{B}}第一篇{{/B}}
| ? ?
Storms Sink Ships ? ?Rescuers have found the bodies of over 130 people killed in two ferry disasters in Bangladesh. The accidents happened during a storm that hit the country on April 21. Hundreds more are missing or feared dead. ? ?The two ferries sank in different rivers near the capital city of Dhakfi as strong winds and rain hit the South Asian country. The government has since banned all ferries and other boats from traveling at night during the April-May stormy season. One of the ferries, MV Mitali, was carrying far more people than it was supposed to. About 400 passengers fitted into a space made for just 300, police said. The second ferry carried about 100 passengers. ? ?"The number of deaths is certain to rise. "said an official in charge of the rescue work. "No one really knows how many people were on board the ferry or how many of them survived. " Ferries in Bangladesh don’t always keep passenger lists, making it difficult to determine the exact number of people on board. ? ?Besides the ferry accidents, at least 40 people were killed and 400 injured by lightning strikes, falling houses and trees and the sinking of small boats. Storms are common this time of year in Bangladesh, as are boating accidents. Ferry disasters take away hundreds of lives every year in a nation of 130 million people. Officials blame these river accidents on a lack of safety measures, too many passengers in boats and not enough checks on weather conditions. ? ?Ferries are a common means of transport in Bangladesh. It is a country covered by about 230 rivers. Some 20,000 ferries use the nation’s waterways every year, a. And many of them are dangerously overcrowded. Since 1977, more than 3,000 people have died in some 260 boating accidents. |
A:Over 130 B:At least 40 C:About 400 D:Over 3,000
第一篇 Storms Sink Ships Rescuers have found the bodies of over 130 people killed in two ferry disasters in Bangladesh．The accidents happened during a storm that hit the country on April 21．Hundreds more are missing or feared dead． The two ferries sank in different rivers near the capital city of Dhaka as strong winds and rain hit the South Asian country. The government has since banned a11 ferries and other boats from travelling at night during the April-May stormy season. One of the ferries, MV Mitali，was carrying far more people than it was supposed to．About 400 passengers fitted into a space made for just 300，police said The second ferry carried about 100 passengers． “The number of deaths is certain to rise,”said an official in charge of the rescue work.“No one really knows how many people were on board the ferry or how many of them survived．” Ferries in Bangladesh don’t always keep passenger lists，making it difficult to determine the exact number of people on board. Besides the ferry accidents，at least 40 people were killed and 400 injured by lightning strikes, falling houses and trees and the sinking of small boats． Storms are common this time of year in Bangladesh, as are boating accidents．Ferry disasters take away hundreds of lives every year in a nation of 130 million people． Officials blame these river accidents on a lack of safety measures, too many passengers in boats and not enough checks on weather conditions. Ferries are a common means of transport in Bangladesh．It is a country covered by about 230 rivers．Some 20,000 ferries use the nation’s waterways(水路)every year．And many of them are dangerously overcrowded(过度拥挤)． Since1977, more than 3,000 people have died in some 260 boating accidents． How many people have been found dead in the two ferry disasters?
A:More than 130. B:Over 3,000． C:About400． D:At least 40.
QT400—15中的400表示( )。
A:抗拉强度大于400MPa B:抗拉强度小于400MPa C:屈服点大于400MPa D:屈服点小于400MPa
