Which sar option generates real-time disk I/O statistics?（） sar -q 。 sar -P 。 sar -d 。 sar -D&e。
有偿新闻
A system administrator has increased the size the logical volume lv00. The administrator now wants to enlarge the filesystem /fs00 that is mounted on lv00 to the same size that lv00 currently is. Which of the following commands will show the administrator the number of blocks to use when increasing the size of the filesystem /fs00？（） lslv /fs00。 lsfs -q /fs00。 lsdev -Cc lv00。 lsattr -El lv00。
（）就是根据成本信息和施工项目的具体情况，运用一定的专门方法，对未来的成本水平及其可能发展趋势做出科学的估计。 施工成本计划。 施工成本控制。 施工成本预测。 施工成本核算。
The bos.perf package is part of the base operating system. Performance Diagnostic tool， PDT， is a part of bos.perf. All of the following statements are true EXCEPT？（） PDT attempts to identify performance problems automatically by collecting and integrating a wide range of performance， configuration and availability data.。 PDT consists of three components， the collection component comprises a set of programs that periodically collect and record data， the retention component periodically reviews the collected data and discards data that is obsolete， and the reporting component periodically produces a diagnostic report from the current set of historical data.。 PDT contains motif-based， AIX licensed programs that can easily access tools for system and network performance tuning， monitoring， and analysis.。 PDT assesses the current state of a system and tracks changes in workload and performance. It attempts to identify incipient problems and suggest solutions before the problems become critical.。
《铁路技术管理规程》规定，制动初速在120~140km／h的列车紧急制动距离须不大于（）。
