在加工一个精度要求较高的圆周时可以采用极坐标编程来加工。
参考答案：错
Many scholars share the belief that interest is as _____ to learning as the ability to understand, even more so to some degree.
A．subtle
B．vital
C．similar
D．obvious
空气滤清器或滤芯的上游和下游规定测压点所测得的静压差是（）
A.绝对压力
B.压力降
C.相对压力
D.压力值
