图示超静定梁，EI为常数，当两端发生图示角位移时引起梁中点C之竖直位移为
（向下）。
（向下）。
举一反三
- 设EI为常数，图示刚架支座C点的水平位移为（ ）。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/2dea6754bc2a40df98d40ddc4d88e4ee.png"/> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/876c3a939abd447fae12277cbbdf2885.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/9452dbf33f1b42bab8d279978b5294d8.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/c86de891367447249efb95cf363ee7cf.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/ba048b2d5eb149fbbe5a7b419903ef5b.png"/>
- 图示刚架的弯矩图中正确的是（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/96bab3bc877f45e6bc366a1ed24b02e3.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/233d0c9147694598ab60919b0ee7a246.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/f8e911921bb447bdb2e8216ff1bca5cf.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/5c0b8a15b9174de3b636c8ea8a2eb281.png" />
- 图示刚架的弯矩图中正确的是（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/9e0e3376473a4da185371f58ac37647e.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/860e38197af74aec8db44a11df45c324.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/6ef75cc1379348698b95f277eda55fdd.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/bc248bb6f0cd424eae6b1e66aeb87da6.png" />
- 已知逻辑函数<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/db3f3ede53184bb3a37a766a36125eab.png" /> 与其相等的函数为 ____。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/b9f375a5635e41d6911d97ab27bfe708.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/bc54dac1e08f483e88b86be39ec320b1.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/da4ddc58a62f4f35b2fe27419d3e7023.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/9aea77b2ed814b77aed36f7301cd7625.png" />
- 有两个化学反应，第一个反应的速率常数为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/4327149b43ae49c3ac77b5d0c84cc7aa.png"/>，活化能为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/349adc341333412a870ba08a9cf01203.png"/>，第二个反应的速率常数为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/041f4e49d23d4ac895caa62faff5e5c7.png"/>，活化能为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/cf2e46d6949c48c999a4dae421f0093a.png"/>，k1 大于k2，则这两个化学反应活化能大小关系正确的是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/6c92556e93a94eb2b3e20966b5eee871.png"/> B: 不能确定 C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/c59bf3d35c3b41a6ae12ba9da0f6acb4.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/e2395739b30f47dd9fd37f780ccee24a.png"/>