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【单选题】
基带信号的码间干扰是由系统的 引起的,或者说是带宽不够产生的。A.
衰减
B.
衰落
C.
失真
D.
噪声
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】— He ought to have been warned of the danger. — ______, but he just wouldn’t listen to me.
A.
So ought he
B.
So he was
C.
So was he
D.
So he had
【简答题】－－－ Ought he to get down to his work at once? －－－ Yes, he _____.ought B. ought to C. must D. sh238. --- Ought he to get down to his work at once? --- Yes, he _____. ought B. ...
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【单选题】He ought to attend the meeting, ?
A.
should he
B.
ought he
C.
shouldn't he
D.
couldn't he
【简答题】电火花加工主要优点和局限性。
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