用户在AutoCAD中建立了新层以后,就可以用PURGE命令来消除0层。()
参考答案:错
—Your handbag is very beautiful. How much does it cost?
—It's not expensive. I _____ only 50 yuan for it. [ ]
A. paid
B. spent
C. cost
D. bought
在下述的地理环境中,属于非地带性分布规律的是()
A.我国内蒙古东部的热带草原
B.青藏高原的高寒草原
C.我国河西走廊的绿洲
D.北美洲北部的苔原带