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【判断题】
载波同步就是获取与发送端用于调制的载频信号同频不同相的本地载波信号的过程。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】—I like big hats. ________? —Yes, I have this one here.
A.
It's five dollars
B.
Can I help you
C.
How can I do for you
D.
Do you have one
【单选题】I never dreamed of ______ such a big crowd here.
A.
there being
B.
there to be
C.
there having
D.
there to have
【单选题】Only when I got here _________ that I had made a big mistake. [ ]
A.
did I realize
B.
I realized
C.
I have realized
D.
have I realized
【单选题】— So how long have you been here? — Just a couple of days actually．I’m on a big journey, you know．I ______all the places of interest here．
A.
am visiting
B.
visited
C.
have visited
D.
will visit
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