举一反三
- 图示梁B端为弹簧支座，设在M作用下，梁的应变能，弹簧的应变能为，则截面A的转角应是下列式中哪一个？
- 能使图示简支梁中的应变能增大一倍的情况是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/f5823b4347254eccbdaadb3bd60cc5af.png
- 下列化合物能形成分子内氢键的是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/017aef1f5b214562b278a4b8e8384bc8.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/4afb87421d00455c9abbef7de2b4e84c.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/acc0e72b43be45d4ad8cabfc177f4ce3.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/8b72d0c501fa45609fc24fc005dc6957.png" />
- 下列化合物不能使三氯化铁溶液显色的是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/d6b1fbe3db92427fb17e6b03441b6314.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/1b39ba90bd784dd4a28af61dec53ee0e.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/bf8365034036486683b612acacc3ed1f.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/8af48ec2142d47e38eaf279ac191eafb.png" />
- 下列化合物发生亲核取代反应活性最大的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/e57c2689c7984597b020823c3c17cfe0.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/4604e9b1bf004c36a84068fbd00db8e5.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/4205ea439468429282bf518c0dcbb095.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/f8810518b81d448b8a178c5189e7f3e1.png" />
内容
- 0
图示为结构在荷载作用下的Mp图，各杆EI=常数，则支座B截面处的转角为：http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/bf69fd89219f4a808efe2fe336df5283.png
- 1
与溴水反应生成白色沉淀的化合物是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/74df21b424b1431d891b617f1a5da454.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/f40edc73e0b7408b84148abcef35e5b1.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/dc1eea010db347fd8e0f56f6aedd2c93.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/57c9f62d66204240bbbd72ec7efdb31a.png" />
- 2
可与硝酸银的氨溶液反应生成银镜的化合物是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/6a4e97024646472bb00be0e30040fa7c.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/53a4027453494ea8bedecacc8f6bb12e.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/e0e31fd6b42c4587a95d288fc45a80cc.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/6ac884327101413198fd997428cc1e27.png" />
- 3
图示超静定梁，如果以弹簧C的约束反力为多余未知力，则变形协调条件为梁在C截面的挠度等于弹簧的变形。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/972e3460291d4e5d9da7b08b6a0b710b.png
- 4
可与2，4-二硝基苯肼反应生成黄色沉淀的是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/bae956a55a934e888b1cabe17e68e866.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/a55be6cad4544a7198346aa1b73398f6.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/7f2334ba5b494271a31027c8f734ee66.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/7dd29a85700641d8baf1a329c5e5b142.png" />