Make sure the table is securely anchored.

Make sure the table is securely anchored. A.repaired B.cleared C.booked D.fixed

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设有表示学生选课的三张表,学生s(学号,姓名,性别,年龄,身份证号),课程c(课号,课名),选课Sc(学号,课号,成绩)

设有表示学生选课的三张表,学生s(学号,姓名,性别,年龄,身份证号),课程c(课号,课名),选课Sc(学号,课号,成绩),则表Sc的关键字(键或码)为( )。

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Questions ·Read the article below about service production

Questions ·Read the article below about service production and the questions o

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