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单选题
IF BOTH ECAM DISPLAY UNITS FAIL:
A
The E/W Displays are no longer available.
B
The E/W Display can still be presented on the ND Display when switched， using the "ECAM/ND TRANSFER" switch.
C
Only the SYSTEM Display can be presented on the ND Display， when the "ECAM/ND TRANSFER" switch is used.
答案解析
正确答案：B
