题目内容

锻件在下列冷却方法中,冷却速度最慢的是()。

A. 堆冷
B. 灰砂冷
C. 炉冷
D. 坑冷

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Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE You issue these statements: CREATE table new_emp ( employe_id NUMBER, name VARCGAR2(30)); INSERT INTO new_emp SELECT employee_id, last_name from employees; Savepoint s1; UPDATE new_emp set name = UPPER(name); Savepoint s2; Delete from new_emp; Rollback to s2; Delete from new_emp where employee_id=180; UPDATE new_emp set name = 'James'; Rollback to s2; UPDATE new_emp sey name = 'James' Where employee_id=180; Rollback; At the end of this transaction, what is true? ()

A. You have no rows in the table.
B. You have an employee with the name of James.
C. You cannot roll back to the same savepoint more than once.
D. Your last update fails to update any rows because employee ID 180 was already deleted.

甲、乙双方签订一份建造l万平方米商品房的合同,由此形成的法律关系客体是()。

A. 乙方承建1万平方米的商品房
B. 承建商品房的工程劳务
C. 甲乙双方
D. 该合同中规定双方的权利和义务

()型变压器能代替BX1-30型变压器。

人知降糖胶囊()国家医保品种,()独家发明专利品种。

A. 是;不是
B. 是;是
C. 不是;是
D. 不是;不是

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