柴油的折标系数是1.4571，电力的折标系数是1.229，国家标准煤发

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问题单项选择题

柴油的折标系数是1.4571，电力的折标系数是1.229，国家标准煤发热量7000CAL/G，省以及地方标准煤的发热量5500CAL/G，省对集团公司的节能指标2008年综合能耗下降15.54%，集团公司对我矿的节能指标是本年度综合能耗下降吨标煤。（）

A.500

B.800

C.1000

D.2000

答案

参考答案：C

阅读理解

阅读理解。

Hello! I am Lily. This is my classroom. There are eight wiridows in the

classroom.

The classroom is very big and clean. There are some desks and chairs.

They arc yellow and black. And there is a blackboard on the wall (墙). Look!

Some flowers are on the teacher's desk. I like my classroom. What about you?

1. How many windows are there in the classroom? .

A. Five.

B. Six.

C. Eight.

2. What colour are some desks and chairs?

A. Yellow and black.

B. Yellow and red.

C. White and black

3. There is a on the wall.

A. picture

B. blackboard

C. drawing

4. Where are the flowers?

A. Beside the window.

B. On the teacher's desk.

C. Behind the desk.

5. Does lily like her classroom?

A. No, she doesn't.

B. We don't know.

C. Yes, she does.

单项选择题

一离散系统，当其输入为x（n）时，输出为y（n）=3x（n-2）+3x（n+2），则该系统是（）。

A.因果、非线性系统

B.因果、线性系统

C.非因果、线性系统

D.非因果、非线性系统