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单选题
WHEN ON "AUTO" POSITION， THE BUS TIE P/B ON THE ELEC CONTROL PANEL， ALLOWS:
A
The AC BUSES to be supplied in parallel by more than one generating source at the same time.
B
The AC BUSES to be supplied by any Main Generator， APU Generator or External Power.
C
The AC BUSES to be supplied by the APU Generator or EXT PWR only.
答案解析
正确答案：B
