You have to finish a project with in 2 weeks and your lead developer had to take 1 week leave due to personal emergency．Another project manager has agreed to loan the service of his lead developer for 1 week．You are taking his help and completing the project．This case is an example of （） (Choose the best answer)．

A．fast tracking

B．crashing

C．risk management

D．resource leveling

溶液的PH值越高，越容易对金属造成腐蚀。