Each hose in the fuel transfer system for helicopter refueling must meet the standards of the（）.

A.Federal Aviation Administration

B.Corps of Engineers

C.National Fire Protection Association

D.National Transportation Safety Board

对治疗苯中毒时的氧化还原过程的恢复，有显著促进作用的营养素是（）。

A.维生素A

B.维生素D

C.维生素B

D.维生素K

E.维生素C