被除数
62.4
624
6.24
除数
12
1.2
商
5.2
1.52
Once he has determined ________ something, no one can change his mind.[ ]
A. to do
B. doing
C. to have done
D. having done
吊装作业时，是否可以使用自制或不规范吊索具？为什么？
