（计算题）
现有一批灯泡，其中残次品有2个，合格品有8个。每次从其中取一件，共取两次，则取到的为一件正品，一件次品的概率是多少？
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最新试题
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该科目易错题
- It can be inferred from the passage that England is rarely hit by high magnitude earth.（）ATrueBFalseCNot Given
- 材料全屏 British Columbia【*】British Columbia is the third largest Canadian province, both in area and population. It is nearly1.5 times as large as Texas, and extends 800 miles (1,280km) north from the United States border. It includes Canada‘s entire west coast and the islands just off the coast.【*】Most of British Columbia is mountainous, with long rugged ranges running north and south. Even the coastal islands are the remains of a mountain range that existed thousands of years ago. During the last Ice Age, this range was scoured by glaciers until most of it was beneath the sea. Its peaks now show as islands scattered along the coast.【*】The southwestern coastal region has a humid mild marine climate. Sea winds that blow inland from the west are warmed by a current of warm water that flows through the Pacific Ocean. As a result, winter temperatures average above freezing and summers are mild. These warm western winds also moisture from the ocean.【*】Inland from the coast, the winds from the Pacific meet the mountain barriers of the coastal ranges and the Rocky Mountains. As they rise to cross the mountains, the winds are cooled, and their moisture begins to fall as rain. On some of the western slopes almost 200 inches (500 cm) of rain fall each year.【*】More than half of British Columbia is heavily forested. On mountain slopes that receive plentiful rainfall, huge Douglas firs rise in towering columns. These forest giants often grow to be as much as300 feet (90m) tall, with diameters up to 10 feet (3m). More lumber is produced from these trees than from any other kind of tree in North America. Hemlock, red cedar, and balsam fir are among the other trees found in British Columbia.11【单选】With which aspect of British Columbia is the passage primarily concerned?（）A Its climateB Its cultureC Its geographyDIts history
- In which part of British Columbia can a mild climate be found?（）A In the southwestBInland from the coastC In the northDOn the entire west coast
- In Paragraph 5, the word"heavily"could best be replaced by which of the following?（）AWidelyBDenselyCChieflyDLargely
- Which of the following is NOT mentioned as a tree found in British Columbia?（）AHemlockB CedarC FirDPine
- What effect do the mountains have on winds?（）AMake them dry.BMake them wet.CMake them cool.D Make them weak.
- （）AissueBpassedCdebateDanotherE otherF internationalGrelatedH influenceIsawJprofessorKnationalLcomfortable
- （）AissueB passedCdebateDanotherEotherF internationalG relatedHinfluenceIsawJprofessorK nationalLcomfortable
- （）A issueBpassedC debateDanotherE otherFinternationalGrelatedHinfluenceIsawJprofessorKnationalLcomfortable
- （）AissueB passedCdebateDanotherEotherFinternationalGrelatedHinfluenceIsawJprofessorKnationalLcomfortable