下列螺钉连接，画法正确的是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/41c1e94adfac4cb585889ed6c0415aec.png
举一反三
- 下列螺栓连接画法正确的是（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/a2a72beead024105b50a0d0e7b917bda.png
- 下列键连接，画法正确的是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/bac8a523591a4796a479aa59a4cb67ed.png
- 下列螺栓连接画法正确的是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/a2a72beead024105b50a0d0e7b917bda.png
- 下列螺柱连接，画法正确的是（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/38b53f4668454991842b502802578c5b.png
- 下列碳正离子的稳定性最大的是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/5ae2658f66544b629fdcabed52d5f957.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/1cefba39460048ef898157ea2ebc28b4.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/451893995c5e4c8f8109398975819582.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/31d934d857664b5c8e554a3b9c0fde75.png">