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【多选题】
视神经脊髓炎的脊髓损害好发于（）A.
颈段
B.
胸段
C.
腰段
D.
骶段
E.
各段没有显著差异
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【单选题】What has the telephone done to us, or for us, in the hundred years of its existence? A few effects suggest themselves at once. It has saved lives by getting rapid word of illness, injury, or fire from...
A.
The telephone has helped to save people from illness and fire.
B.
The telephone has helped to prevent wars and conflicts.
C.
The telephone has made the modern city neither better nor worse.
D.
The telephone has had positive as well as negative effects on us.
【简答题】量化位数决定了音乐的____,指的是每个采样点所代表音频信号的____。
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