The close project or phase process is essential to overall project planning. What is considered one of the most important steps in closing project or phase

A) Insuring that plans are produced to implement the project by phases.
B) Issuing work orders so that financial data can be collected.
C) Transition the lease of equipment to the owner.
D) Satisfying the contractual obligations.

电力牵引的交流制就是牵引网供电电流为直流的电力牵引电流制。