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【单选题】
易受潮而变质的药物应()。A.
放在阴凉干燥处
B.
密闭保存
C.
放在阳光充足处
D.
晒干
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举一反三
【单选题】关于因果稳定离散时间LTI系统，以下说法错误的是_____。
A.
其系统函数的收敛域可能是有限 z 平面内的环状区域
B.
单位脉冲响应是绝对可和的
C.
系统函数的收敛域包含单位圆
D.
其单位脉冲响应的双边 z 变换与单边 z 变换的结果相同
【简答题】死腔样通气
【简答题】The United States is full of 1 . There are still many families without cars, but some families have two or even more. However, cars are used for more than pleasure. They are 2 part of life. Cars are u...
【简答题】死腔样通气
【单选题】关于因果稳定离散时间LTI系统，以下说法错误的是 。
A.
其单位脉冲响应的双边Z变换与单边Z变换的结果相同
B.
其系统函数的收敛域可能是有限Z平面 内的环状区域
C.
系统函数的收敛域包含单位圆
D.
单位脉冲响应是绝对可和的
【简答题】They have offices in the ______ (commerce) heart of the city.
【单选题】They have offices in the ___________ heart of the city.
A.
commerce
B.
commercialize
C.
commercial
D.
commercially
【简答题】The United States is full of automobiles. There are still many families without cars, but some families have two or even more. However, cars are used for more than pleasure. They are a necessary part ...
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