光缆配盘宜按出厂盘号顺序排列。非出厂盘号顺序排列时，相邻两盘光缆的光纤模场直径之差应小于（）μm。

Directions:

Write an essay of 160-200 words based on the following drawing. In your essay, you should

1) describe the drawing briefly,

2) explain it’s intended meaning, and

3) give your comments.

Your should write neatly on ANSWER SHEET 2.