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单选题
On B757 the external power of electrical system is checked by BPCU before supplied to its electrical network. If the EXT PWR is checked normal, the contactor is closed.
A
在757上外电源由BPCU检查后再接入电网。如果外电源检查正常，断路器闭合。
B
在757上外电源由BPCU检查后再接入电网。如果外电源检查正常，接触器关闭。
C
在757上外电源由BPCU检查后再接入电网。如果外电源检查正常，接触器闭合。
答案解析
正确答案：C
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