在NAIP的航图手册中编号为“ZBTJ-6A”的航图是天津滨海国际机场的（）。

When the A/C flies from one airmass into another, an airmass with different（ ）properties may be expected.

The boundary between airmasses is called a （ ） ．

An air mass is a body of air that （ ） ．

A high cloud is composed mostly of （ ） ．

Low clouds usually consist almost entirely of （ ） ．

Fair weather cumulus clouds often indicate （ ） ．

The （ ） is a large body of air with fairly uniform temperature and moisture content.

Turbulence will occur when aircraft in flight encounter （ ）.

（ ） clouds indicate a fairly deep layer of unstable air. They contain moderate to heavy turbulence with icing and often develop into thunderstorms.

The term “embedded thunderstorms” indicates that （ ） ．