民航安全管理的组织因素时代具备什么特点

关于工具说法正确的是：

工具三清点制度是：

与机组联系时，尽量采取的方式是：

常用的航空器轮档有：

This is not what we asked you to do. You can not get more pay for the （        ）work.

When the airplane takes off, the passengers are told to （        ）their seat belts.

Water and air are （        ）to human beings. We can not live without them.

Please （        ）me for my rudeness. I really do not know the custom here.

This is an （        ）that will not be easily forgotten.

Chocolate and ice-cream have different （       ）.