题目内容

Conversation 2 Which room does the woman suggest（）

A. On the second floor.
B. On the fifth floor.
C. In the front of the hotel.
D. In the middle of the hotel.

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凯登认为，任何形式的______都必然会招致行政上的不正之风。

关系R(A，B，C)和S(C，D，E)进行关系代数运算，下列各关系表达式中成立的是______。

A. π3(R)∪π1(S)
B. πA，B(R)-πC，D，E(S)
C. πA，B(R)＞＜πD，E(5)
D. π2(R)∩π1(S)

标准化工作的任务是制定标准、组织实施标准和对标准的实施进行监督， (20) 是指编制计划，组织草拟，审批、编号、发布的活动。

A. 制订标准
B. 组织实施标准
C. 对标准的实施进行监督
D. 标准化过程

With the help of the experts, the factory produced（）machines in 2001 as the year before.

A. as twice many
B. twice as many
C. as many as twice
D. as twice as many