The advanced worker, _____ to devote himself to the factory, has succeeded in developing new techniques

of production. [ ]

A. determined

B. determining

C. having determined

D. to determine

重复定位能提高工件的(　　)， 但对工件的定位精度有影响 ，一般是不允许的。

A．塑性

B．强度

C．刚性

D．韧性