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【单选题】
大信号包络检波器的输入电阻R i 约为检波负载R L 的( ) 。A.
、1 倍
B.
、2 倍
C.
、 倍
D.
D、1/2 倍
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皮皮学刷刷变学霸
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【简答题】I twisted my ankle three days ago, but I’m still in _______.
【单选题】下列命题错误的是( )
A.
属于不同特征值的特征向量必线性无关
B.
属于同一特征值的特征向量必线性相关
C.
相似矩阵必有相同的特征值
D.
特征值相同的矩阵未必相似
【单选题】听力原文：W: I heard Dan twisted his ankle during basketball practice yesterday. M: I guess that explains why I sew him at the clinic. Q: What can we know about Dan? (16)
A.
He had a doctor examine his injury.
B.
He will go to practice tomorrow.
C.
He didn't call the woman yesterday.
D.
He asked a friend to take him to clinic.
【单选题】The ankle biter twisted his _____ when he jumped.
A.
anchor
B.
ankle
C.
anger
D.
angle
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