皮皮学，免费搜题
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【简答题】
画出QPSK、OQPSK和π/4-DQPSK的星座、相位转移图，并说明各自特点？
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反馈参考答案：
举一反三
【单选题】There is milk in the fridge. You need to buy some. [ ]
A.
a few
B.
a little
C.
few
D.
little
【单选题】腾讯公司的微信、QQ等软件的语音通话或视频通话功能极大地方便了用户的需求,它们主要采用的信息交换技术是()
A.
电路交换
B.
报文交换
C.
分组交换
D.
资源交换
【单选题】There is milk in the bottle. Could you please get for me? [ ]
A.
a little; any
B.
little; some
C.
a few; some
D.
a little; some
【单选题】There is milk in the refrigerator.I have to go and get .
A.
little；some
B.
a little；any
C.
few；some
D.
a few；any
【单选题】There is milk in the fridge. Please go and buy some, Jim.
A.
little
B.
few
C.
a little
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