活动图是面向对象的而流程图是面向过程的。

岑溪市重点打造的天龙顶山地公园在2013年12月27日试业了．在此之前，公园派出小曾等人到某旅游景区考察，了解到该景区三月份共接待游客20万人次，五月份共接待游客50万人次．小曾想知道景区每月游客的平均增长率x的值，应该用下列哪一个方程来求出？（　　）

A．20（1+x）²=50

B．20（1﹣x）²=50

C．50（1+x）²=20

D．50（1﹣x）²=20

As we all know, we are what we eat. ________, it’s very important for us to form healthy eating habits. _________, bad eating habits are still very common among us students. _______ the fact that bad eating habits will do harm to our health, we students never take it seriously.

A. Nevertheless        B. Therefore          C. Though                D. Thus

A. Otherwise           B. Despite             C. However            D. Afterwards

备用电源系统（ABEX,HMG,SEP)向什么汇流条供电？

A、Essential DC bus(Using the TRU)

B、Essential AC bus(Using the E-inverter)

C、Essential DC bus(Using the TRU)和Essential AC bus(Using the E-inverter)

D、Essential DC bus(Using the E-inverter)和Essential AC bus(Using the TRU)