把x=5代入方程2b(x-1)=3,
24b=3,
解得,b=16.
故答案为:16.
第二节:开放作文(15分)
请根据下面提示,写一篇短文。词数不少于50。
In your English class, your teacher shows you the following picture. You are asked to describe the picture and explain how you understand it.
档案库和查阅档案用房采用人工照明时,应选用()。
A、日光灯
B、紫色灯
C、红色灯
D、白炽灯