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【判断题】
在纯电感正弦交流电路中,若电源频率提高一倍,而其他条件不变,则电路中的电流将变为原来的1半A.
正确
B.
错误
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举一反三
【单选题】In drawing up the plan, they went to the library to _____ many books. [ ]
A.
bring up
B.
referr to
C.
look for
D.
try on
【简答题】A.packing up to go abroad． B.Brushing up on her English． C.Drawing up a plan for her English course． D.Applying for a visa to the United States．
【简答题】A．Packing up to go abroad. B．Brushing up on her English. C．Drawing up a plan for her English course. D．Applying for a visa to the United States.
【单选题】普通调幅信号电流的频谱和LC并联谐振回路阻抗的幅频特性和相频特性如图所示，则产生的普通调幅信号为（ ）。【图片】
A.
u AM = R e I sm [1 + m a cos( W t - p / 4)]cos w c t
B.
u AM = R e I sm (1 + m a cos W t )cos w c t
C.
u AM = R e I sm [1 + 0.707 m a cos( W t - p / 4)]cos w c t
D.
u AM = R e I sm (1 + 0.707 m a cos W t )cos w c t
【简答题】You might just as well tell the manufacturer that male customers ________ not like the design of the furniture. A．must B．shall C．may D．need
【单选题】普通调幅信号电流的频谱和LC并联谐振回路阻抗的幅频特性和相频特性如图所示，则产生的普通调幅信号为（ ）。【图片】
A.
u AM = R e I sm [1 + 0.707 m a cos( W t - p / 4)]cos w c t
B.
u AM = R e I sm (1 + 0.707 m a cos W t )cos w c t
C.
u AM = R e I sm [1 + m a cos( W t - p / 4)]cos w c t
D.
u AM = R e I sm (1 + m a cos W t )cos w c t
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