画法正确的旋转剖视图是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/479019d916484fb4892ffbce72c46521.png

在下图中，螺纹连接画法正确的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/388e6231e1fb4ef09858a435d5076944.jpg" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/5c2ff529f94044ffaf8ccbc591499df6.jpg" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/578fcb9927c044a4b982bf3e7e7616a3.jpg" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/bb9122c2834242f4afba03761d066fb8.jpg" />

下列螺钉连接，画法正确的是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/41c1e94adfac4cb585889ed6c0415aec.png

下列螺栓连接画法正确的是（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/a2a72beead024105b50a0d0e7b917bda.png

下列键连接，画法正确的是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/bac8a523591a4796a479aa59a4cb67ed.png