磁盘阵列在作成RAID5方式后出现一个硬盘故障，不影响数据的正常访问，但应尽早更换故

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (54) an educational institution, and they are required to study for a (55) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (56) resources to support themselves (57) in this country.

In order to work here the foreigner needs a work permit, (58) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (59) these permits, and there is little that can be done (60) it; it would be extremely unwise for a foreign visitor to work (61) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (62) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (63) part-time jobs while they are studying here.

55().

A.minimum 

B.maximum 

C.minority 

D.majority

关于总监理工程师的论述，下列不正确的是（）。

A.是设备监理单位履行设备监理职责的全权负责人

B.也称为项目经理

C.总监理工程师是技术职称

D.是一个管理职务

招标人对任何一位投标人所提问题的回答，应( )。

A．发送给提出问题的投标人

B．发送给每一位投标人，并注明提出问题的投标人名称

C．发送给每一位投标人，但不必说明问题的来源

D．作为提出问题的投标人中标后的洽谈内容

某实验室一共有3种类型的机器人，C型能识别颜色、S型能识别形状，X型既不能识别颜色也不能识别形状。3类机器人都能根据简单命令拿起实验品。实验室对l号机器人和2号机器人进行实验，当命令它们拿起红球时，1号拿起的是红方块，2号拿起的是蓝球。 根据上述实验，以下哪项断定一定为真？

A.1号和2号都是X型 

B.1号和2号都不是X型 

C.1号是C型且2号是S型 

D.1号不是S型且2号不是C型

简述相似放大的基本原理。