下图是某国南方某河流的一河段,该河若流出山口,常常形成的地貌是
A、冲积平原
B、山麓冲积扇
C、沙洲
D、三角洲
答案:B
The boss made the workers ____ for twelve hours a day.[ ]
A. worked
B. to work
C. working
D. work
锅筒筒体矫圆时,冷矫变形量不能大于材料外部纤维伸长率的______。
A.2%~3%
B.3%~5%
C.5%~8%
D.7%~10%