装卸搬运作业组织是遵循经济效益为主，安全生产为辅的原则。
参考答案：错
容器施工动火时，必须按规定吹扫干净，保证氧气含量为（）才可动火。
A、≦20.5%
B、≦22%
C、≦25%
The book Been There, Done That written by a Chinese American graduate is _____ a real story. [ ]
A. made of
B. known for
C. kept from
D. based on
