直升机的垂直安定面的主要作用是（）
A、增强方向安定性C
暂无解析
This is the song ____ I often listen in the Globle Dance Hall.
All of us know, color-blind people often find it difficult to __ between blue and green.
We all found_____ to play the game.
There is a tree ____ a group of League members often play chess.
题目：抱怨和索赔信函
