维生素E的需要量以何者为活性单位？

A．视网醇（Retinol）

B．α-生育醇（α-Tocopherol）

C．胆钙化固醇（Cholecalciferol）

D．烟草酸（Nicotinic acid）.

Rebaselining may be required in cost control when （）.

A．CVs are severe, and a realistic measure of performance is needed

B．revised cost estimates are prepared and distributed to stakeholders

C．corrective action must be taken to bring expected future performance in line with the project plan

D．EAC shows that additional funds are needed to complete the project even if a scope change is not needed