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" />

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" />

下列方程所对应的曲面为双曲抛物面的是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/3d9f8275e809414fb56a08f8128ba5d0.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/08c3e00fc9dd4a8c80260f92cbe9abd8.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/eda72acdb3ae4cf189947af5eefee38d.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/4ef0c2211e5840aea14a76e80e8965a5.png" />

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" />

l-矩阵<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/500186eca47a45dfbdb56b3f454593c8.png" />的Smith标准形为()。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/29463535c69144b08617f313e85b7d59.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/be82c74bd5e6499b9c4bd798f704df00.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/509e3bfd1b114727974787c7f1dab1a9.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/777d67f69e83438f95215aa7434519d5.png" />