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？http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/5c44cda80d564812bd46cad58ad6e339.png
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" />