皮皮学，免费搜题
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搜题
【单选题】
已知某网络函数 ,则该网络的单位阶跃响应中( )。A.
有冲激响应分量；
B.
有稳态响应分量；
C.
响应的绝对值不断增大
D.
其他选项都不正确
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】锌的缺乏症有哪些?
【简答题】A．He wants to get a racer or a touring bike. B．He wants to use it to go traveling. C．He wants to use it to get him back and forth from work. D．He wants to use it to do some exercises.
【单选题】—Why doesn't Jack get his TV set repaired? —I know _____. He wants to buy a new one . [ ]
A.
why he doesn't
B.
why doesn't he
C.
how doesn't he
D.
how he doesn't
【简答题】描述钙,磷,锌,硒的典型缺乏症有哪些?造成贫血的矿物质营养有哪些元素?如何补充这些缺乏的矿物质营养?
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