题目内容

钻井泵安全阀的开启压力不得超过循环系统部件的（）。

A. 最高额定压力；
B. 最低额定压力；
C. 最高额定压力的70%；
D. 最低额定压力的70%。

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The ORDERS table belongs to the user OE. OE has granted the SELECT privilege on the ORDERS table to the user HR.Which statement would create a synonym ORD so that HR can execute the following query successfully?（）

A. CREATE SYNONYM ord FOR orders; This command is issued by OE
B. CREATE PUBLIC SYNONYM ord FOR orders; This command is issued by OE
CREATE SYNONYM ord FOR oe.orders; This command is issued by the database administrator
D. CREATE PUBLIC SYNONYM ord FOR oe.orders; This command is issued by the database administrator&e

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