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【多选题】
带传动的特点是()
A.
结构复杂
B.
运行平稳且噪音小
C.
不能缓冲吸振
D.
造价低，不用润滑，容易维护保养。
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【简答题】A relation R as shown R(S#,SNAME,SDEPT,DIRECTOR,C#,GRADE) S# SNAME SDEPT DIRECTOR C# GRADE S01 Yang D01 Qin C01 90 S02 Li D01 Qin C01 87 S01 Yang D01 Qin C02 92 S03 Liu D02 Wang C01 95 S04 An D02 Wang...
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