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国防政策是国家制定的指导国防建设和国防斗争的行动准则。我国国防政策的基本内容有( )。
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Fiil in the blanks with the words given below. Change the form where necessary.Each word can be used only once.1. Given the chance to show his ability, he regained ___________ and began to succeed in school.2. It is so difficult to ____________ the bottom of the ocean because some parts are very deep.3. It was about 30 seconds before Alex _________ from the water; we were quite scared.4. We often ___________ that when other people do the same things as we do, they do them for the same reasons; but this assumption is not always reasonable.5. There is widespread concern that the rising unemployment may _________a threat to social stability.6. After a(n) _____________ physical exam, my doctor said I was in good condition except that my blood pressure was a little high.7. It is well known that China is a country with rich natural __________ and a very big population.8. Some people believe that the earth can ____________ enough food to support at least twice its present population.9. Sam __________ the gift of imagination from his family, but he lacked the driving power to take action.10. A bee that has found honey is able to __________ to other bees the information they need in order to collect the honey.
热源到热用户散热设备之间的连接管道称为（）。
经散热设备散热后返回热源的管道称为（）。
供暖系统按（ ）的大小分类：局部供暖系统、集中供暖系统和区域供暖系统。
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