曳引机铭牌上的额定速度是1m/s；安装时用2∶1绕绳.轿厢的速度是（）m/s。

A.0.25

B.0.5

C.0.75

D.1

The（）provides the project manager with the authority to apply organizational resources to project activities.

A.project management plan

B.contract

C.project human resource plan

D.projectcharter