常见节门的检漏点有（）.
A.两个法兰盘位置
B.节门大盖处
C.节门小盖处
D.节门盘根处
参考答案：A, B, C, D
When asked why he enjoys rock climbing so much,Bibby said,"It's basically like dancing on the rock.
It's a challenge________man against nature."[ ]
A. of
B. for
C. by
D. over
为什么应使用装源工具装卸放射源？
