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【单选题】
设某线性系统的单位冲激响应为 为系统的激励信号,则 是系统的A.
自由响应
B.
零输入响应
C.
完全响应
D.
零状态响应
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反馈参考答案：
举一反三
【单选题】心尖的体表投影位于
A.
左侧第5肋间隙，左锁骨中线内侧7-9cm处
B.
左侧第5肋间隙，左锁骨中线外侧7-9cm处
C.
左侧第5肋间隙，左锁骨中线内侧1-2cm处
D.
左侧第5肋间隙，左锁骨中线外侧1-2cm处
【单选题】Though there is no one in the hall, he stands on the stage as if he ____watched and expected to deliver a speech.
A.
has been
B.
had been
C.
were being
D.
is being
【简答题】A．He missed the . B．He would have watched the . C．He liked the very much and watched it. D．Watching a film is the last thing for him to do,
【单选题】--- He hasn’t watched the movie “ So Young”, has he? --- ______. He told me it was very moving and interesting, he’d like to watch it again.
A.
Yes, he has
B.
Yes, he hasn’t
C.
No, he hasn’t
D.
No, he has
【单选题】心尖的体表投影位于?
A.
左侧第4肋间隙，锁骨中线内侧1-2cm
B.
左侧第4肋间隙，锁骨中线外侧1-2cm
C.
左侧第5肋间隙，锁骨中线内侧1-2cm
D.
左侧第5肋间隙，锁骨中线外侧1-2cm
【单选题】心尖的体表投影位于:
A.
左锁骨中线与第五肋间隙交点内侧1cm~2cm
B.
左锁骨中线与第五肋间隙交点外侧1cm~2cm
C.
右锁骨中线与第五肋间隙交点内侧1cm~2cm
D.
右锁骨中线与第五肋间隙交点外侧1cm~2cm
【简答题】He watched the bed ______ (carry)out of the door．
【简答题】A．He was taken to the manager. B．He was closely watched. C．He was asked to leave. D．He was overcharged.
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