在风险评价公式R＝p·f中，f指的是( )。
A．事故的大小
B．事故发生的频率
C．事故后果的严重性
D．人员暴露于危险环境中的危险程度
参考答案：C
中年患者，AFP升高，结合图像，最可能的诊断是（）
A.肝血管瘤
B.肝癌
C.结肠癌肝转移
D.肝硬化
E.肝炎
What does the speaker think of Jack
A．He’s boasting of his own team.
B．He’s speaking ill of the speaker’s team.
C．He likes to bet money for his team.
D．He enjoys betting with the speaker.
