单选题
______ is a method of constructing a project schedule
network diagram that uses boxes or rectangles, referred to as nodes, to
represent activites and connects them with arrows that show the
dependencies. This method includes following types of
dependcies or precedence relationships. ______, the initiation
of the successor activity，depends upon the completion of the predecessor
activity. ______, the initiation of the successor
activity，depends upon the initiation of the predecessor activity.