All the staff who worked in Libya have been flown back to China, ______.  [      ]

A. tired but safely      

B. tiredly but safe  

C. tired but safe  

D. tiredly but safely

当工件加工后尺寸有波动时，可修改（）中的数值至图样要求。

A、刀具磨耗补偿

B、刀具补正

C、刀尖半径

D、刀尖的位置