按热力学分类，由α相β相为一级相变，则其相变特征是() A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c0fba5fc3fd9486e9595e057099b4fb7.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/31b0e59ca4514a2d920ffb2605ee1864.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/8669999525164f51bac9ed30f5067429.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/f39ef47427164774b6f4153c6c300e10.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/15cc1ade6dae4c6ead266095b40e6809.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/7347833ef3c5413f9e506e0f48ca519e.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/f39ef47427164774b6f4153c6c300e10.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/31b0e59ca4514a2d920ffb2605ee1864.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/8669999525164f51bac9ed30f5067429.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c0fba5fc3fd9486e9595e057099b4fb7.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/31b0e59ca4514a2d920ffb2605ee1864.png" >，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c4736875605d471fb62de7fdb639f4ae.png" >

图示铆钉连接，铆钉的挤压应力σbs为（）。<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/b8e86bfb0fff41b7b9e57e2445615892.png"> A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/4a7f324702d744a58b593467a2b9c4b9.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/b0e1da662dfc4cada52e7088274f5991.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/a67f5ae9ded948448e24eae7e8714fa7.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/e9a3ada35d3b477a93d360335305e00b.png">

正确的全剖视的左视图是（）。<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c8108aaf6b9e4d8d8288dccc92caa773.png" > A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/b383bc6b97ed4c4aa6faf378b5c0dd8e.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/a7aeefd059e04d909f49b1f32b8eb644.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/675821eb2ae8403ca7537392dcc633af.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/dde1d5412a7c4d98b687d2c3b76b3c27.png" >

下面三视图正确的有（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/b223b1ae5d9d40929158d9bbcd70688b.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/3ca48c5305c34feb9f8fa92c4b8011f8.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c0455dd5f9364e7fb9ddab1d8e5cbf3e.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/4d716651ccfe47829019aadb944670bf.png" >

理想气体向真空膨胀过程中（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/b5a408ce6e3748d0bc85a3438d41d4b3.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/a6829bafb8b8404c9c25db85d8c45a32.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/0a15434bd2624753baf1ddad159dd8da.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/17d3e65c317a4e3095c60b2292ff0d97.png" >

下列偏好是相似偏好的有（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/03e75da569094609a208f92966746245.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/d90530a177674c5ca7b2ae0c1a430bef.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/db0bd821537f4fd0ae5822c3dcac660f.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/6a29b9b5dd584ea6b1c19e0a00ab156d.png" >

下列哪种条件下可以得到酚酯？ A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/08815fc33fa54872918d9948e274015a.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/2a317185ef5848c288253fefdf061c53.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/e629d22c3a094f97925f053969ec269b.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/6574cb35c64f41e4a3067c3838b2d19d.png" />

考虑装配工艺性时，下面的结构设计哪个工艺性好？ A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/f2ad0d06ed5c41e685c2df77f3a0db97.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/23d3dd266a4545b2a553fb240f081a3c.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/6227d2f7b1bb449198d01b39253ae074.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/66650c819dc14c1ba115356d0476d0ee.png">

以下是一些系统函数的收敛域，则其中稳定的是()。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/c05f69717a214356a5f18a4b6899ca6a.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/fc079e2aad0a4f6285b861d7ed3b5cee.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/4144dae3ee5e497bbe5567f664e1045a.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202005/ac101952a39c456da9f0443233498d24.png" >

【单选题】布拉格方程的基本形式为( )。 A. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/a6ec2750c3ac451d83c2505168c54865.png B. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/8a62e42ecae14787a75f5b9f880aa191.png C. h