关于楼宇自动化系统集成的原则，下列叙述正确的是（）A、保持技

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关于楼宇自动化系统集成的原则，下列叙述正确的是（）

A、保持技术先进性

B、系统具有开放性

C、集成后的系统便于管理

D、可扩充性好

E、系统运行中的各种操作具有安全性

F、有最好或接近最好的投资效益，即系统集成是经济合理的

答案

参考答案：A, B, C, D, E, F

阅读理解

阅读短文，判断正(T)误(F)。

My name is Jane. I'm a student. My favourite season is summer. Because

l like swimming and I can go to the beach on summer holiday. Last summer,

I went to Beidaihe with my mum and dad. I swam very well. I had a

swimming game with my dad. I won the game. My dad bought me a

beautiful swimsuit. It is pink and blue. I like it verymuch.

( ) 1. Jane's favourite season is spring.

( ) 2. She likes swimming very much.

( ) 3. She is going to Beidaihe with her mum and dad.

( ) 4. Her mother bought her a new swimsuit.

( ) 5. Her swimsuit is blue and pink.

( ) 6. She had a swimming game with her mum. She won the game.

填空题

X、Y、Z三种物质有如下转化关系：

（1）根据上述转化关系，写出下列物质的化学式：X______、Y______、Z______

试剂甲______，试剂乙______

（2）写出上述③④⑤步反应的离子方程式：______．