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单选题 关于时不变系统,以下描述正确的是
学科：信号与系统（22-23-1）
时间：2025-12-27 01:43:37
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题目1单选题
下列叙述正确的是 ( )A. 各种数字信号都是离散信号B. 各种离散信号都是数字信号C. 数字信号的幅度只能取1或0D. 将模拟信号抽样直接可得数字信号
题目2单选题
从观察的初始时刻起不再施加输入信号,仅由该时刻系统本身具有的起始状态引起的响应称为( )A. 零输入响应B. 零状态响应C. 瞬态响应D. 稳态响应
题目3单选题
<img src="https://p.ananas.chaoxing.com/star3/origin/97667983e5f2b246dce54b90e456794d.png">A. 是偶函数B. <img src="https://p.ananas.chaoxing.com/star3/origin/7a414011aeefbc2cbadd638f3f239f8b.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/6259878341079cebf3ba1bb985758de0.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/f70bb50e4c43172a77440e304470e058.png">
题目4单选题
某连续时间系统,其起始状态为<img src="https://img-ph-mirror.nosdn.127.net/fnfJBsep61NLp8ysRUDRQQ==/6631396519676435221.png">, 输入激励为<img src="https://img-ph-mirror.nosdn.127.net/mdupcFxlsOkyvuscItqFIQ==/6608438716887735791.png">,系统的完全响应为<img src="https://img-ph-mirror.nosdn.127.net/An0Bj4yw02TeJvCw4kT1Qw==/6619515197025592278.png">, 若<img src="https://img-ph-mirror.nosdn.127.net/ATnQyz014O88b7h-HXKEYw==/6619425037073291301.png">,则该系统为( )A. 非线性时不变系统B. 非线性时变系统C. 线性时不变系统D. 线性时变系统
题目5单选题
关于时不变系统,以下描述正确的是A. 系统响应仅与当前以及过去的激励有关B. 激励延迟,则响应也延迟同样的时间, 同时响应波形形状不变C. 线性系统才有可能是时不变的D. 必须满足分解性
题目6单选题
已知某线性非时变连续系统, 当其初始状态<img src="https://img-ph-mirror.nosdn.127.net/ss-fqNkZbbXyJ4ZcVZ0SvA==/6631378927490398820.png">时, 系统的零输入响应<img src="https://img-ph-mirror.nosdn.127.net/6UVombhuMgc5lOi_F6Y7Ww==/6630344287049497639.png">,<img src="https://img-ph-mirror.nosdn.127.net/cyenSRlB6DToxitEngdarw==/1605533267257716153.png">. 若在初始状态<img src="https://img-ph-mirror.nosdn.127.net/9WAnHzbPGJP_a8zmn3cqMw==/6630690633212751418.png">以及输入激励 x(t)共同作用下产生的系统完全响应 <img src="https://img-ph-mirror.nosdn.127.net/5DNZ_bnDv_fOAsnOVhDSrQ==/6630391566049496448.png">,<img src="https://img-ph-mirror.nosdn.127.net/cyenSRlB6DToxitEngdarw==/1605533267257716153.png">, 则系统在初始状态<img src="https://img-ph-mirror.nosdn.127.net/9WAnHzbPGJP_a8zmn3cqMw==/6630690633212751418.png">以及 输入激励为<img src="https://img-ph-mirror.nosdn.127.net/d2hDteGtQ1EQImpnEZvHwA==/6630660946398808807.png">共同作用下 产生的系统完全响应<img src="https://img-ph-mirror.nosdn.127.net/u1200zL8FTatBkVTwEiunw==/6630202450049517182.png">( )A. <img src="https://p.ananas.chaoxing.com/star3/origin/be2fb16f728b7fc13f03ac121147b9ec.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/b13140ecfccf957c9f46776201ac04b0.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/e8a5edad60f7f062cf3f120d1a7b12c4.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/702d9a3dc0c96f682df93793931f585a.png">
题目7单选题
<img src="https://p.ananas.chaoxing.com/star3/origin/9ac2739272c166695edc9c726be52258.png">A. <img src="https://p.ananas.chaoxing.com/star3/origin/56639aa1105cdf3c52b32d61ae49b74c.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/b873e951e2c243ff89847ac050283941.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/0d6caf579c65148d319bc0aa85f1d352.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/47de60cb30c51724ccb575ec23654d92.png">
题目8单选题
满足傅氏级数收敛条件时,周期信号f(t)的平均功率( )A. 大于各谐波分量平均功率之和B. 不等于各谐波分量平均功率之和C. 小于各谐波分量平均功率之和D. 等于各谐波分量平均功率之和
题目9单选题
双边指数信号<img src="https://img-ph-mirror.nosdn.127.net/Vlcdx_cu3MkPij2rJy_TUA==/3882102878893962230.png">的 傅里叶变换为( )A. <img src="https://p.ananas.chaoxing.com/star3/origin/525279b4ebb0be66d3e59711e40bb38e.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/c0738969d8a6d569a1c8d395a9c04e98.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/0c4a0cb0fab20931a96f77c4ce184320.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/17829f64eb18e9c0e71d4a2fa342cbca.png">
题目10单选题
<img src="https://p.ananas.chaoxing.com/star3/origin/9ae16943337a8f1a4e9178d84a9ffa12.png">A. 150HzB. 200HzC. 400HzD. 100Hz
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