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【单选题】
某系统的传递函数为 G( S )= , 其零、极点是 ( )。A.
零点 s=－0.5,s=-2；极点s=－3,s=2
B.
零点 s=3,s=－2；极点s=0.5,s=3
C.
零点 s= － 3,s=2 ；极点 s= － 1,s=3
D.
零点 s=－3,s=2；极点s=－0.5,s= - 2
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B.
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【单选题】Can you imagine______up the high mountain? [ ]
A.
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B.
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D.
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