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【单选题】
系统稳定的充要条件是( )A.
幅值裕度大于0分贝
B.
相位裕度大于0
C.
幅值裕度大于0分贝，且相位裕度大于0
D.
幅值裕度大于0分贝，或相位裕度大于0
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反馈参考答案：
举一反三
【简答题】市场调研的方式有哪些?
【单选题】He ______ the ups and downs he had gone through in the past two years.
A.
recalled
B.
reminded
C.
recited
D.
recollected
【单选题】Through the years he ______ sufficient money to buy a flat by driving taxi.
A.
provided
B.
increased
C.
reassured
D.
accumulated
【判断题】Andy succeeded in prison escape through the tunnel he dug for years mainly in order to seek freedom and justice.
A.
正确
B.
错误
【单选题】Through the years he ________ sufficient money to buy a farm.
A.
gathered
B.
accelerated
C.
accumulated
D.
accused
【单选题】Through the years he ____________ sufficient money to buy a big house.
A.
reserved
B.
stored
C.
preserved
D.
accumulated
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