施工层纵横向水平杆间距符合构造要求的脚手架计算项目有（）
A.脚手板
B.纵横向水平杆
C.立杆
D.连墙件
E.立杆基础
参考答案：B, C, D, E
He was diagnosed with cancer last month, but he carried on with his work ______ nothing had happened.
A．even thought
B．as if
C．so that
D．in case
循环冷却水使用二氧化氮为什么宜采用现场活化？
