‎下图立体投影已知主视图和俯视图，它所对应的左视图正确的是。‌<br/> ‎<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/f78fce4b09e847d9ba730418b4c8cc03.png?x-oss-process=image/sharpen,200"/>‍‌