https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/8961d14854d348848440a27bf62c83ca.png

将扬氏双缝干涉实验装置放入折射率为n的介质中，其条纹间隔是空气中的 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/c95635ce72a849538975d8db8b46c522.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/f8288c3d5f1142faa90e71323aa5dc91.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/2987a330c95f4c86b5cb38030330a3ef.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/57ebaf5744c14ffcbb710139760a6720.png" />

钢结构设计中钢材的设计强度为（）。 A: 强度标准值<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/48ea082bb6914c69b614f526e5704b90.jpg"> B: 钢材屈服点<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/bcb79dd9534b45bcafcee365d857a702.jpg"> C: 强度极限值<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/8a5c1278c9ff4626a2e323359613a883.jpg"> D: 钢材的强度标准值除以抗力分项系数<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/e6e73171d0d54a5394d3a148bc87792f.jpg">

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" />

选出图示是的树的选项：(   )https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/1662921c73e2406385246bbfab642058.png