加热工必须具备（）方可上岗操作。
A.指吊证
B.焊工证
C.煤气操作证
D.会计证
参考答案：C
Considering the different demands of students, the school has adopted a more ____ approach to
education.[ ]
A. independent
B. responsible
C. flexible
D. considerate
建筑透视图是用（）投影法绘制的。
