男性，67岁，右腹股沟区肿块1年，渐增大，但晚间卧床后肿块缩小。昨突发右下腹痛，伴呕吐2次，腹痛阵发性加重。体格检查：全腹平软，右下腹压痛，无肌紧张，肠鸣音8～12次／分，偶闻气过水声。男性，56岁，右上腹胀痛3个月伴黄疸半月余。体检：肝肋下3cm，剑突下4cm，质硬，移动性浊音(+)。最可能的诊断为（）
A. 晚期肝癌
B. 肝硬化
C. 细菌性肝脓肿
D. 胆总管结石
E. 肝炎
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？（）
A. PDT attempts to identify performance problems automatically by collecting and integrating a wide range of performance， configuration and availability data.
B. 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collect and record data， the retention component periodically reviews the collected data and discards data that is obsolete， and the reporting component periodically produces a diagnostic report from the current set of historical data.
C. PDT contains motif-based， AIX licensed programs that can easily access tools for system and network performance tuning， monitoring， and analysis.
D. 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.
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