题目内容
Does the body of the letter show ________? Have you chosen expressions to produce goodwill?
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Is your message ________? Have you used specific and definite terms in making an offer or requiring a response?
Have you prepared the writing with the readers in mind, and try to put yourself in his/her place to indicate that you are ________?
信息检索一般以（）的形式存储。
常见的数据库有文献型数据库和（）。
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