投资学是工程项目决策咨询工作的理论依据。 ( )
参考答案：对
Over a very large number of trials, the probability of an event ________is equal to the probability that it will not occur.
A．occurring
B．occurred
C．occurs
D．occur
没有( )的发生，风险最终也无法导致损失；它是损失的媒介物。
A．风险程度
B．风险事故
C．损失
D．风险因素
