Cnut was the son of Svein.
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在共射极放大电路中,经过晶体管的信号()
A. 只有直流成份
B. 只有交流成份
C. 交直流成份都有
共射极放大电路中,电容的作用是()
A. 滤波
B. 耦合
C. 整流
Who was the first Roman general to come to Britain?
A. Juius Caesar
B. Claudius
C. Togidubnus
D. Queen Boudicca
How many times did Juliu Caesar invade Britain?
A. 1
B. 2
C. 3
D. 4