图示有侧移结构，设横梁的水平侧移为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5b1b0d2260734afd9d372476eccd0a52.png"/>，计算约束状态下杆件的固端弯矩，正确的是（ ）<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0bb431e37a424b1f841ad9350d80f241.png"/> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/ef65ff72dc6b4179bee92ce4ff148aad.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5ca987b52284485a986cb954a09b51a0.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0c7f5a6de2714ac0bbb5a243d9b8da4b.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/94aab58ed2f94f90af7c4ea00aecf764.png"/>

逻辑函数F (A,B,C)=Σ m (0，1，4，6)的最简与非-与非式为（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/6677dfd1ca0a4255871fff8d24c1bfe1.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5556e6fba4d849c988d994a19156d44a.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/6f296abd190d40b19f2f737f02c7adca.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/b2bf2478b09b4e6ab818d71adb4a8715.png"/>

求解线性方程组Ax=b,当detA≠0时，方程组的解是( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/2dd3562df6f94737b874abc058d6f140.png" /> B: A/b C: b./A D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/feb99de14dd442cab2629dac769711db.png" />

设<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/bed4f91f4fec44358e1cad3163fc6b90.png" />是在区间<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/a58a11f71a434f2ab38a2f347802f010.png" />上的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/a392447e03794318affaa2b03bb5967b.png" />的分段线性插值函数，以下条件不是<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/c00fe77a8291453a8cb2577eb68735ad.png" />必须满足的条件是________________. A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/cf6e811a4488413fae8f1839e4d098ea.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/bb93b2d7d02245878ec51e2986c97b5d.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/ec6692c00c2e49b6adbf9b0493638b81.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/214f277da4154f58a43751f80b09d959.png" />

某离散时间系统的系统框图如图所示，其中x表示输入信号，Y表示输出信号，系统的差分方程可以表示为？<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/f17b1754961a482eb540b5229ed1d3b7.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/0769d057673d4151b1f0b41af2ffe512.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/3538ab9355d34bdb854faaddbd64abd6.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/62652baf39794e328f736a5e1dc4a701.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/90ff953c2cb044b8a0662afaf143d417.png" />