【名词&注释】
死亡率(mortality)、发病率、对照组(control group)、百分比(percentage)
[单选题]PDM includes four types of dependencies or precedence relationships: (). The completion of the successor activity depends upon the initiation of the predecessor activity.
A. Finish-to-Start
B. Finish-to-Finish
C. Start-to-Start
D. Start-to-Finish