寿命期相同的互斥方案比选方法一般有()。
A.净现值法
B.差额内部收益率法
C.差额内部净现值法
D.最小费用法
E.内部收益率法
参考答案:A, B, C
Soon after the mud-rock flow hit Zhouqu, Gansu Province, many soldiers came to the ______ as many people were trapped underground.
A.shelter
B.identity
C.rescue
D.Disaster
保安徒步巡逻一般以组队形式进行,主要有()等形式。
A.单线巡逻、往返巡逻、交叉巡逻、点线巡逻
B.单向巡逻、往返巡逻、环形巡逻、固定巡逻
C.单线巡逻、往返巡逻、环形巡逻、交叉巡逻
D.单向巡逻、往返巡逻、交叉巡逻、环形巡逻