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问题 单项选择题 A1/A2型题

在滤膜相衬显微镜超高频数法测定空气中石棉纤维方法中，计数的纤维应符合（）。

A.宽度小于1μm

B.长度大于5μm

C.宽度小于3μm

D.长度大于10μm

E.长度与宽度之比大于3：1

答案

参考答案：A

填空题

在对网络运行及维护前首先要了解网络，包括识别网络对象的硬件情况、判别局域网的拓扑结构和信道访问方式、确定网络互联以及用户负载等。常见的3种拓扑结构是星型、 (1) 与 (2) 拓扑结构，而常见的信道访问方式有 (3) 及 (4) 。 网络配置和运行包括一系列保证局域网络运转的工作，主要有：选择网络操作系统和网络连接协议等；配置网络服务器及网络的外围设备，做好网络突发事件预防和处理；网络安全控制，包括网络安全管理、网络用户权限分配以及病毒的预防处理等。配置网络过程中要做好数据备份工作，一般来说，备份的硬件设备包括磁盘、 (5) 和 (6) ，而利用磁盘备份的方法常用的是磁盘镜像、 (7) 以及磁盘阵列，其中前两者的区别在于 (8) 。 网络维护是保障网络正常运行的重要方面，主要包括故障检测与排除、网络日常检查及网络升级。一定要建立起 (9) 制度，记录网络运行和变更的情况，以保证维护经验的交流与延续。
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单项选择题

Prior to the UML, there was no clear leading (111) language. Users had to choose from among many similar modeling languages with minor differences in overall (112) power. Most of the modeling languages shared a set of commonly accepted concepts that are expressed slightly differently in various languages. This lack of (113) discouraged new users from entering the OO market and from doing OO modeling, without greatly expanding the power of modeling. Users longed for the industry to adopt one, or a very few, broadly supported modeling languages suitable for (114) usage.

Some vendors were discouraged from entering the OO modeling area because of the need to support many similar, but slightly different, modeling languages. In particular, the supply of add-on tools has been depressed because small vendors cannot afford to support many different formats from many different (115) modeling tools. It is important to the entire O0 industry to encourage broadly based tools and vendors, as well as niche products that cater to the needs of specialized groups.

（113）是（）

A.agreement

B.understanding

C.characteristic

D.diversity
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