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【简答题】
已知二次型f(x1，x2，x3)=5x12+cx32一2x1x2+6x1x3—6x2x3的秩为2，求参数c及此二次型对应矩阵的特征值．
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【单选题】听力原文：M: So, when are the other guys going to get here? The train is leaving in 10 minutes. We can't wait here forever! W: It's 10:30 already? They are supposed to be here by now! I told everybody to m...
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At 10:40.
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【单选题】The train is leaving five minutes.
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after
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at
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in
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for
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【单选题】听力原文：M: So when are the other guys going to get here? The train is leaving in 10 minutes. We can't wait here for ever. W: It's 10:30 already. They're supposed to be here by now. I told everybody to me...
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At 10:30.
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S+vt.+O
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S+vi.
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S+vt.+O+OC
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【单选题】------Hurry up! The train is leaving at ten past fifteen. We only have half an hour. -------Oh, my God. I thought the train_______ at eleventhirty.
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is leaving     
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wouldleave      
C.
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三环抗抑郁药    
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氯丙嗪
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【单选题】目前应用最广的抗焦虑药物是( )
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三环抗抑郁药
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SSRIs
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氟哌啶醇
D.
氯丙嗪
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苯二氮卓类
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【单选题】听力原文：M: So, when are the other guys going to get here? The train is leaving in 10 minutes. We can't wait here forever! W: It's 10:30 already? They are supposed to be here by now! I told everybody to m...
A.
At 10:30.
B.
At 10:40.
C.
At 10:25.
D.
At 10:45.
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【单选题】听力原文：M: The train goes at six fifteen. W: Oh! I have to hurry. The train is leaving in five minutes. Q: What's the time now? (20)
A.
Six o'clock.
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Six twenty.
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Six ten.
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SSRIs
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氟哌啶醇
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Six ten.
查看完整题目与答案