山区机场最后进近航段的MOC最大可增加（）。

After the landing of the hijacked aircraft, controller should guide it to taxi to the position with a safe distance from（ ） .

A high or a （ ） is generally associated with good visibility, calm or light winds, and few clouds.

A col is （ ） ．

A （ ） is an area of low pressure surrounded by higher pressure.

A （ ） is a center of high pressure surrounded on all sides by lower pressure.

The resulting pattern of the isobars reveals the change in pressure over distance, which is normally called （ ） ．

The feature associated with the tropopause is （ ） ．

The lines of equal wind velocity are called （ ） ．

The lines that connect points of equal temperature are called （ ） ．

When an aircraft is flying （ ）, we call it super low-altitude flying.