7岁男孩，发热、咳嗽1周，胸闷不适2d。查体：心律140/min，心律不齐，ECG示频发室性早搏伴二联律，测CK-MB增高，血清肌钙蛋白T增高。可初步诊断为

A．风湿性心肌炎

B．病毒性心肌炎

C．中毒性心肌炎

D．甲状腺机能亢进

E．以上均不是

Of the following types of historical information that can be used in risk identification，which is the least reliable

A．Project file

B．Commercial database

C．Project team knowledg

D．Lessons learned database