三级耐火等级民用建筑每层最大允许建筑面积为（）平方米A.1000 B.6600 C.

以下关于双机热备份叙述不正确的是（）

A.双机热备份就是一台主机为工作机，另一台主机为备份机

B.在系统正常运行情况下，工作机为信息系统提供支持

C.双机热备份模式的切换时机与双机互备援模式的切换时机一致

D.当工作机出现异常时，原来的备份机改为工作机，而原来的工作机不再使用

人耳镫骨肌反射阈是（）

A.10～20dB

B.20～30dB

C.40～50dB

D.50～60dB

E.70～90dB

影响写字楼分类的因素中，一栋建筑物的( )和物业外立面维护的水平是影响物业吸引力的两个重要物理因素

A．建筑设计形式

B．位置

C．声望或形象

D．周围环境

输液是特殊的注射剂，它不适合与哪些注射液配伍？

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Since the average test score of students enrolled in charter schools were rising 7.5 percent in the spring, many educators concluded that the system was working.（）

A. Since the average test score of students enrolled in charter schools were rising 7.5 percent in the spring, many educators concluded

B. As the average test score of students enrolled in charter schools rose 7.5 percent in the spring, with many educators concluding

C. Because the average test score of students enrolled in charter schools rose 7.5 percent in the spring, many educators concluded

D. Because the average test score of students enrolled in charter schools were up 7.5 percent in the spring, many educators concluded

E. With average test scores rising by 7.5 percent among students enrolled in charter schools, and many educators concluded