按照测量管理制度的要求，以下未体现测量工作双检制的是( )。

A．测量工作必须两个人共同进行

B．测量外业工作必须有多余观测

C．测量成果采用两组独立平行计算相互校核

D．外业工作采用两种不同方法进行复核测量

●Precedence Diagrammin gMethod(PDM) is a method used in activity sequencing.There are four types of dependencies or precedence relationships in PDM. The initiation of the successor activity depends upon the completion of the predecessor activity is called__(75)__.

A．Finish-to-Start

B．Finish-to-Finish

C．Start-to-Start

D．Start-to-Finish