，则( ).A: 初始条件为
=1，
= 2, 递归关系为
(n≥3).B: 初始条件为
=1，
= 1, 递归关系为
(n≥3).C: 初始条件为
=1，
=1, 递归关系为
(n≥3).D: 初始条件为
=1，
= 2, 递归关系为
(n≥3).
举一反三
- 下列选项哪些是立体干燥花（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/e0a75b2333b848a4b2deab3fd3cadfaa.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/d11fc544a6f94867affb44c7c8facf5a.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/66be30e1dc6b4777b36729ae181aefeb.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/0b0d4724e987493fb7eb224f50bf0ddf.png">
- 设个体域D是正整数集<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/bb49a9cddeaa40059632876d46e1298b.png" />，则下列公式中真值为真的公式是( ). A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/4db4b88de97b4847a6f2b4090e1371fb.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/c1f2498d60dc44da87a3b72af11eaba6.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/9e2d538cbefc45d5afe417f98245df4d.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/1cdf577968f74f709f161cd354e74195.png" />
- 设 A(x):x 是鸟, B(x):x 会飞，命题“有的鸟不会飞”符号化为( ). A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/6fdacd6a161c4b25847f4cd5a68cac5c.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/bb2efef1471b4434a3cb4b0870aef87a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/37783eb9873b470b948695eade3b0dc4.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/a59cb9338b1b445d94a7159d2cfa01da.png" />
- 设Zm= {0, 1, 2, …, m - 1}，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/211f8e3b46b646598e53d85def442786.png" />是模m乘法运算，则(Zm, <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/60da1bba21044182aebb1e783993e81f.png" />)是群.
- 如图所示电路的逻辑表达式F=（ ）。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/8655693a417e4e43a32e0732ed533c96.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/beda73211aea49f082d9137fd4eb0526.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/7388c99ee0824f20bcf85893934a2f6a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/9a5c81e78b344c79a9389e932a7f55ce.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/82193a9a030243728012b02e15718987.png" />
内容
- 0
横桥的特性是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/d9109b1706b24ebdaaa4fd2ade011f0b.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/3e73caf4907c4732b31655818429fd1f.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/22fe3c7df73445cdbc78681845eb442f.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/dda726f3f23e497ea5706434c05ee729.png"> E: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/1e933a32e7764e73841cf6d1ad056e95.png">
- 1
网络函数<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/058dbbb5ab294d2980b41cd68dc78e69.png" />，其相应的单位冲激响应<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/efd689742f00449b818fd884bf9fd2cf.png" />为（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/571d5a5173d64731a7a1ed5c3ffaf403.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/b923d3ac7e9743c68ad701c170b784b4.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/d3c454406cd94e97a23806c9ba83d4e0.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/159fc59d34794c2b9f24f1ddbc368a14.png" />
- 2
设A=<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/bc546fc03fdb4ba3b7e6b144b6371d7f.png" />，B=Р(Р(A)) 下列（ ）表达式不成立。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/6e615703da60435893f9e9a9273e12e5.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/64c831067d054e71a6c76f43849d450d.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/72023a5250e44c12b98923044194f13d.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/c48e039a739c4502830eee7ae0ac1678.png" />
- 3
下列用量子数描述的、可以容纳电子数最多的电子亚层是……… （ ） A: n=4,<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/770d7ff80ba34c14835ae968265b8730.png"/>=3 B: n=2,<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/770d7ff80ba34c14835ae968265b8730.png"/>=1 C: n=3,<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/770d7ff80ba34c14835ae968265b8730.png"/>=2 D: n=5,<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/770d7ff80ba34c14835ae968265b8730.png"/>=0
- 4
下列线性同余方程组<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/1767de8f76fc4b3c96948e0d33bda350.png" />在模<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/b54a333f3782438e804dfde6259208c2.png" />下的解为 A: 6731 B: 2310 C: 2111 D: 4421