COS5020G示波器显示某通道的正弦信号波形如下图所示，这时该通道的VOLTS...

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搜题

【单选题】

COS5020G示波器显示某通道的正弦信号波形如下图所示，这时该通道的VOLTS/DIV旋钮位于“0.5V”位置，TIME/DIV旋钮位于“0.5ms”位置。该正弦信号的幅值与频率分别为（）。

1V，1000Hz

1V，500Hz

2V，1000Hz

2V，500Hz

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参考答案：

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SELECT 姓名 FROM 职工 SET 年龄＞50

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at anchor

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【单选题】Under the rules and interpretations of the AICPA Code ,

a CPA can be a client advocate during an audit, but not while performing tax or management services.

staff auditors should always defer to the judgment of their immediate supervisor.

a conflict of interest is a relationship that might interfere with objectivity or integrity.

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【单选题】对于第7题的两个基本表，有一个SQL语句： SELECT ENO, ENAME FROM EMP WHERE DNO NOT IN (SELECT DNO FROM DEPT WHERE DNAME='金工车间');其等价的关系代数表达式是：______。

πENO,ENAME(σDNAME≠'金工车间'(EMP DEPT))

πENO,ENAME

πENO,ENAME(EMP)-πENO,ENAME (σDNAME='金工车间'(EMP DEPT))

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SELECT*FROM 学生 WHERE NOT EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生.学生号)

SELECT*FROM 学生 WHERE EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生号)

SELECT*FROM 学生 WHERE NOT EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生号)

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相关题目：

【单选题】检索职工表中年龄大于50的职工姓名，正确的命令是( )。

SELECT 姓名 WHERE 年龄＞50

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a CPA can be a client advocate during an audit, but not while performing tax or management services.

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πENO,ENAME(σDNAME≠'金工车间'(EMP DEPT))

πENO,ENAME

πENO,ENAME(EMP)-πENO,ENAME (σDNAME='金工车间'(EMP DEPT))

πENO,ENAME (EMP)-πENO,ENAME (σDNAME≠'金工车间'(EMP DEPT))

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【单选题】在学生表中查找没有选课的学生，下列语句正确的是( )。

SELECT*FROM 学生 WHERE EXISTS； (SELECT*FROM 选课 WHERE学生号=学生.学生号)

SELECT*FROM 学生 WHERE NOT EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生.学生号)

SELECT*FROM 学生 WHERE EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生号)

SELECT*FROM 学生 WHERE NOT EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生号)

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