数据库设计分为以下六个阶段_______、________、________、________、________和________。
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Exercise1：Choose the proper words to fill in the blanks.1.What’s the ______(matter/up)?
Please follow the _______(instructions/instruct) of the staff.
How can I get _______ (in/out)of the station?
Please move to the middle of the ________(train/platform).
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