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______是位于用户和数据库之间的一个数据管理软件。

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Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage Which of the following is NOT true of the Americans’ sense of time

A. There are penalties for being late or not keeping commitment in time.
B. It is unthinkable to quantify time.
C. The future is not very far ahead of people.
D. They take the depth of time for granted.

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保证软件质量的手段主要包括复审、复查、管理复审和______。

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In Sections A, B and C you will hear everything once only. Listen carefully and then answer the questions that follow. Mark the correct answer to each question on your ANSWER SHEET.SECTION A CONVERSATIONS In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. Questions 1 to 3 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation. Where was the man when the robbery happened

At home.
B. In his office.
C. In the street.
D. At a friend’s.

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简论春秋时期公布成文法的历史意义。

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