【单选题】
A A.Battery switch ON - Standby Power switch to BAT = the entire fuel system operate normally.
B B.Battery switch ON - Standby Power switch to BAT = the entire fuel system operate normally. except the fuel shut-off system.
C C. Battery switch OFF - Standby Power switch to BAT = the entire fuel system operate normally.
D D.37. With failure of all generators, the center tank fuel :
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