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【简答题】
常规双边带调制是指用基带信号f(t)叠加一个直流分量后去控制载波c(t)的 ,使已调信号的包络按照f(t)的规律线性变化,通常也把这种调制称为常规调幅(Amplitude Modulation),简记为AM。
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举一反三
【单选题】He would certainly have got there on time ______.
A.
had he not had a flat tire
B.
if he didn't get a flat tire
C.
if the flat tire hadn't happened
D.
had the tire hadn't flattened itself
【单选题】If he had not missed the train, he ______ there by then. A. might get B. might have got C. got D. had got
A.
might
B.
might have got
C.
got
D.
had got
【单选题】He ____ angry because he ____ for a long time. [ ]
A.
had got; had waited
B.
got; waited
C.
had got; waited
D.
got; had waited
【单选题】甲贸易公司和乙税务机关签订了买卖合同，口头约定若发生合同纠纷，由合同履行地A市的仲裁委员会来仲裁，后甲乙发生了合同纠纷，则下列说法中正确的是( )。
A.
若甲向A市的仲裁委员会申请仲裁，仲裁委员会应当受理
B.
在买卖合同中，甲乙不属于平等主体
C.
若乙向A市的人民法院提起诉讼，人民法院应当受理
D.
A市的仲裁委员会是行政机关
【单选题】No sooner ______ home ______ I told him the exciting news.
A.
had he got; when
B.
had he got; than
C.
he had got; when
D.
he had got; than
【单选题】When he_ _____to the cinema, the film ______for half an hour. [ ]
A.
got; had begun
B.
got; had been on
C.
had got; was on
D.
had got; had been on
【简答题】It was after he got what he had desired he realized it was not so important. A.that B.when C.since D.as
【单选题】Only when he got there _____how much damage had been caused.
A.
be realized
B.
he had realized
C.
had he realized
D.
did he realize
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