什么是加工精度?
参考答案:
加工精度是指零件加工后的几何参数与理论零件几何参数相符合的程度。相符合的程度越高,误差愈小,加工精度就越高。加工精度通常应控制在一个合理范围。
关于胁痛的治疗,以下哪项是错误的:
A.多取原穴或背俞穴
B.主穴可取神门、三阴交
C.心脾亏损者,毫针刺用泻法
D.脾胃不和者,加胃俞、足三里
E.心肾不交者,加心俞、太溪
A
Anyone can become a member of School Watch because ______.
A.everyone may have problems
B.everyone is useful
C.everyone needs to make some friends
D.everyone can give help to others