双向晶闸管的正反向伏安特性完全对称,正反向可互换使用()
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通过电力连接线的电流量可以大于电力连接线额定容量()
A. 对
B. 错
三端集成稳压器的输出有正、负电压之分,应根据需要正确的选用()
A. 对
B. 错
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
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