Which of the following statements is used to prevent user TOM from adding and deleting data in table TAB1?（）A、REVOKE ADD, DELETE FROM USER tom ON TABLE tab1B、REVOKE ADD, DELETE ON TABLE tab1 FROM USER tomC、REVOKE INSERT, DELETE FROM USER tom ON TABLE tab1

题目

Which of the following statements is used to prevent user TOM from adding and deleting data in table TAB1?（）

A、REVOKE ADD, DELETE FROM USER tom ON TABLE tab1
B、REVOKE ADD, DELETE ON TABLE tab1 FROM USER tom
C、REVOKE INSERT, DELETE FROM USER tom ON TABLE tab1
D、REVOKE INSERT, DELETE ON TABLE tab1 FROM USER tom

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According to the passage, which of the following statement is not true?A.the heat exchanging surfaces should be kept substantially cleanB.the heat exchanger flow passages should be clear of obstructionC.seals for the plate heat exchanger needs to be renewed oftenD.the cleaning process of the plate heat exchanger should be done following our experiences only

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第2题

Which of the following performance tools will work with optimized code and also provides source statement profiling？（）A、 profB、 gprofC、 kprofD、 tprof

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第3题

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第4题

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第5题

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第6题

Given the following code fragment： public void create（） { Vector myVect； myVect = new Vector（）； } Which of the following statements are true？（） A、 The declaration on line 2 does not allocate memory space for the variable myVect.B、 The declaration on line 2 allocates memory space for a reference to a Vector object.C、 The statement on line 2 creates an object of class Vector.D、 The statement on line 3 creates an object of class Vector.E、 The statement on line 3 allocates memory space for an object of class Vector.

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第7题

You just issued the following statement: ALTER TABLE SALES DROP COLUMN PROFIT. Which of the following choices identifies when the column will actually be removed from Oracle?（）A、Immediately following statement execution B、After the ALTER TABLE DROP UNUSED COLUMNS command is issued C、After the ALTER TABLE SET UNUSED COLUMN command is issued D、After the ALTER TABLE MODIFY command is issued

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Which of the following statement

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