缓慢发生的肝性脑病，其最早出现的症状为

A．意识模糊

B．肝臭

C．行为异常，欣快

D．定向力障碍

E．意识模糊

A project management team is evaluating the causes that might contribute to unsatisfactory performance and quality．Which of the following statements is not true ？（）

A．Normal process variation is attributable to random causes and sometimes also called“white noise”．

B．Special causes are easier to predict and handle than random causes(also called common caus

C．Special causes are unusual events which are difficult to foresee and mostly produce outlier

D．A process can be optimized to limit the bandwidth of variations due to random cause