民用运输机起飞前必须将襟翼放下到规定的起飞位置，否则（）。

The （ ） is attached to the back of the horizontal stabilizer.

The （ ） is mounted at the back of （ ）．

The （ ） is attached to the back of the （ ） ．

During flight, （ ） can be used to move the nose left and right for desired heading.

During flight, （ ） can be used to move the nose up and down for desired altitude or height.

To initiate a turn, the pilot use the （ ） and （ ） in combination.

Which of the following does not go with all the others?

Which word does not go with all the others?

Which of the following is a primary control system?

Which of the following is an assistant control system?