Which two statements are true about the rescue configuration file?（）

A

It must include a root password

B

It is roll back file number 50, and you can recover it by issuing rollback 50

C

It is created by issuing request system configuration rescue save

D

It is updated automatically when you commit

肾炎性水肿易出现于（）

A、眼睑、颜面

B、胫前、足踝

C、阴囊、会阴

D、胸腔、腹腔

E、背部、骶部

交换机（）是由于外部供电不稳定，或者电源线路老化或者雷击等原因而引起的。

A、电源故障

B、端口故障

C、模块故障

D、背板故障

A p5-570 8-way 32GB system has been proposed to a customer as a new test system with four LPARs.  The current applications are certified on AIX 5.2 but not yet on AIX 5.3.  The customer wants to understand the advantages and disadvantages of this solution versus a pair of 4-way p5-550s with 16GB each in testing their current applications. Which of the following points should the pSeries technical specialist highlight？（）

A、The p5-570 would save rack space over a pair of p5-550 servers.

B、The p5-570 allows for more CPU and memory resources to be dynamically allocated to any LPAR for performance testing.

C、The p5-570 can only be upgraded to 64GB of RAM without replacing memory.

D、The p5-570 supports advanced features such as Micro-Partitioning and Virtual I/O allowing more LPARs of the customer’s applications with fewer processors and fewer I/O adapters.

文件系统规定了计算机对文件和文件夹进行操作处理的（）

A、标准

B、非标准

C、机制

D、标准和机制

You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0, How many usable host address will there e per subnet?（）

A、510

B、1022

C、2046

D、8190