题目内容

三相四线制电源，其中线上一般不装熔断器及开关（）

A. 对
B. 错

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Whenthe“CHECKATT”appear（）

Attitude data on both PFDs differs by more than 9 °.Flashes for 5 s, then remains steady.
B. Attitude data on both PFDs differs by more than 5 °.Flashes for 9 s, then remains steady.
C. Attitude data on both PFDs differs by more than 5 °.Flashes for 9 s, then disapear

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