二维图纸匹配过程中用到的CAD操作过程有()
A. 平移
B. 旋转
C. 立体移动、旋转
D. 缩放
换元法求积分时,换元所假设的中间变量“ t”,在最后结果中
A. 需要还原成“ x”
B. 不需要还原成“ x”
You have __________ a great deal of experience and now can work independently.
You have ________a deeper level of experience and now can work independently.