Which of the following on the beaufort scale of wind force is equivalent to strong winds 以下那一级别在蒲福氏风级中代表强风？
3.
The beaufort scale is divided into 13 levels , from the calm wind of force 0 to hurricane wind of force 12 蒲福氏风级分为十三级，从无风的零级到飓风的十二级。
4.
The table below illustrates the relationship between the descriptive terms of wind speeds , the beaufort force and wind speeds 下表显示描述风力的术语蒲福氏风级和风速的关系：
5.
Wind speed is the speed of the air flow . it is usually expressed in kilometres per hour or as a force on the beaufort scale 风速是指空气的移动速度，一般以公里每小时或蒲福氏风级来表示。
6.
Wind speed is the speed of the air flow . it is usually expressed in kilometres per hour or as a force on the beaufort scale 风速是指空气的移动速度，一般以公里每小时或蒲福氏风级来表示。
7.
For a more relaxing speed , cruising or light - wind windsurfing takes place in winds of approximately 10 knots and under 为了有一个更让人放松的速度，每小时十哩以内的风级中可以进行游弋或微风风帆冲浪。
