对中国籍船舶安全检查的依据是（）
A、我国有关法律、法规
B、我国有关规章
C、我国技术规范
D、已生效的国际公约
参考答案：A, B, C
Don’t talk about such things ______you are not sure of, ______ is what you should keep in mind.
A．as; which
B．as; that
C．that; as
D．what; where
教学工作的中心环节是（）
