设 A(x):x 是鸟, B(x):x 会飞，命题“有的鸟不会飞”符号化为( ).
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 某人举步上楼梯，每步跨1个台阶或2个台阶，设上n个台阶的不同方式数为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/62999550ec1547439283cd9872427fdc.png" />，则( ). A: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/e5083263b09044c1b6e95baed3ef628c.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/07aa95ceccda433f8e9432a186fae005.png" />= 2, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/ad0a958e510040be8f4253d0526d7ce5.png" />(n≥3). B: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/d5cc33a9d0714d3fbba386ccff5f8aaa.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/34a42e4a62ea448db919ffa607f5de44.png" />= 1, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/c3dc9b741afa4ae68983bc1d5db5e065.png" />(n≥3). C: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/405917811f9845e1915af00c9fa30c79.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/ccd3e7a79651413b8cd22dbf5cd05ac8.png" />=1, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/0acc9967cdab4f31a918b5fc8fe38608.png" />(n≥3). D: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/245baeee86b943e4bd7f1c39803b142c.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/a06359868bb1457e81ab7e102d212630.png" />= 2, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/0aee376a7bfa44da9f431ecb21e6c787.png" />(n≥3).
- 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.
- 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" />