中厚板单道焊线能量大，焊缝和热影响大，晶粒粗大，塑性和韧性较低。 ( )

At the end of the closing process group，（）.

A．it is verified that the defined processes are completed within all the process groups to close the project phase

B．it is determined that the product of the project is completed satisfactorily

C．project management plan is written off by the project sponsor

D．new change requests are initiated as required