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【判断题】
乙类双电源互补对称功率放大电路(OCL电路)中，两只管子交替导通，两路电源交替供电，实现双向跟随。A.
正确
B.
错误
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【单选题】降压变压器的电压比 K
【单选题】… you got the news that the rocket was sent up successfully? ……From the radio.
A.
How was it that
B.
How it was that
C.
What was it that
D.
What it was that
【单选题】The news the rocket was successfully launched spread all over the country.
A.
what
B.
that
C.
which
D.
why
【单选题】According to the news, who claimed responsibility for the rocket attack?
A.
A 36-year-old Israeli man.
B.
Palestinian militants.
C.
Israel's offensive.
D.
Hamas
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【单选题】降压变压器的电压比 K