试简述选择机件标刻部位的原则。
参考答案:
(1)显目部位;
(2)非工作表面;
(3)设计指定位置。
A.可以省距离,同时也可以省功
B.可以省力,同时也可以省功
C.可以省力或省距离,但不能省功
D.只有在费力情况下才能省功
Knowledge and learning are important if we want to be successful, but they may also ______ our
thinking. [ ]
A. direct
B. limit
C. change
D. improve