在网络计划中，若某工作的( )最小，则该工作一定是关键工作。
A．持续时间
B．自由时差
C．时间间隔
D．总时差
参考答案：D
144. The reason why the two _____ cannot speak _____ language is that they were born in America and were brought up in a Japanese family.
A．Germans; German
B．Germen; the German
C．Germen; German
D．Germans; the German
确定信息来源是工作分析中的（）的工作。
A.准备
B.描述
C.调查
D.计划
