图（A）所示桁架，采用图（B）所示的基本结构，其变形协调条件的力法方程可以写为：δ₁₁X₁+△1_p=△，其中△应为（）。

A、A

B、B

C、C

D、D

What is East Timor famous for as an emerging tourism destination()

A. One of the newest countries in the world.

B. Unspoiled natural beauty.

C. Hundreds offish species.

D. A former war zone.