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下列选项中，关于UPDATE语句的描述，正确的是（）
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数据类型的作用：数据类型决定了数据存储的空间和格式，有助于正确、有效地存储数据。（）
建立主键的目的就是为了实现实体完整性。（）
Fill in the blanks with the words given. Change the forms if necessary. Each one can be used only once.terminationslumpdeterioratespiralcomplydrasticlikelihoodevictvergeoriginate1. Brian Wood watched his financial life ________ downward just when he thought he had overcome the obstacles which had been dominating his past.2. A __________ in your confidence may result from your premature optimism about life.3. ____________ as the measures were, little progress was made in improvement of social order.4. His indulgence in （沉溺于） fun seeking has brought him to the _________ of indifference to life.5. In much of the country, abuse of land resulted in a forced ___________ of farmers.6. They have got a letter ordering the immediate _________ of their occupancy (居住).7. Believe it or not, friendship is apt to ____________ in times of crisis.8. I asked the waitress to refill my coffee cup and she happily _______ repeatedly until I had consumed enough coffee to stay up all night and study for my exam.9. The way you view the task ahead of you determines your mindset and your __________ of success.10. This type of system which _________in the United Kingdom has been widely used throughout Europe.
对于具有N个结点 的电路，其独立的结点数为（ ）
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