在下列有关压杆临界应力<img src="https://static.zxtiku.com/wangke/imgs/topic/a05baa9cfa39d52c578ee6305381fe9a.jpg"/>的结论中，（ D ）是正确的。<br/> A、细长杆的<img src="https://static.zxtiku.com/wangke/imgs/topic/a05baa9cfa39d52c578ee6305381fe9a.jpg"/>值与杆的材料无关<br/> B、中长杆的<img src="https://static.zxtiku.com/wangke/imgs/topic/a05baa9cfa39d52c578ee6305381fe9a.jpg"/>值与杆的柔度无关<br/> C、中长杆的<img src="https://static.zxtiku.com/wangke/imgs/topic/a05baa9cfa39d52c578ee6305381fe9a.jpg"/>值与杆的材料无关<br/> D、粗短杆的<img src="https://static.zxtiku.com/wangke/imgs/topic/a05baa9cfa39d52c578ee6305381fe9a.jpg"/>值与杆的柔度无关