Hydraulic System A pressure is supplied directly to the landing

Hydraulic System A pressure is supplied directly to the landing gear _______(转换活门) which ______ (通过旁路)to allow system A pressure to the selector valve for normal extension and retraction of the landing gear and nose wheel steering.

A.shutoff valve, bypass

B.check valve, is biased

C.transfer valve ,is biased

D.transfer valve ,is routed

正确答案是C