‎拉伸体<img src="https://storage.tutusouti.com/psst/files/821067bcfa1947b6be2e4015137ab801.png?x-oss-process=image/sharpen,200"/>的动平面如图a所示，其正确的轴测图是:‌<br/> ‎<img src="https://storage.tutusouti.com/psst/files/00f87ddfc69e4248a1fed06b1b7a2d71.png?x-oss-process=image/sharpen,200"/>‌