Inspired by the seniors in college and      his own responsbilities，Dick is determined to work harder．

A．to recognize

B．recognizing

C．recognized

D．being recognized

数控车床所选择的夹具应满足安装调试方便、钢性好、( )高、使用寿命长等要求。

A．可加工性

B．粗糙度

C．精度

D．机械性能