血细胞分析仪进行白细胞检测时，首先改变白细胞体积的方法是（） A.电阻抗法 B.VC

如现在投资10万元，预计年利率为10%，分5年等额回收，每年可回收()万元。已知：(A/P，10%，5)=0.26380

A.2.638

B.2.138

C.2.100

D.2.771

蒸腾作用发生的部位是（　　）

A．根

B．叶

C．所有器官

D．茎

阅读理解

     I loved music when I was young. I learned to play the guitar at 11 and I wrote my first song four years

later. My dream was to become a country singer.

After years of hard work, a record company was showing interest in me. One day during a trip to

Nashcille, a friend offered me a bit of meth (一种兴奋剂).I didn't know then that meth is the easiest,

cheapest drug to get, and also one of the most addictive. So I smoked it and that was all I thought about

for the next year and a half .I couldn't live without it.

     When the police arrested me, I looked like death. The first seven days in prison, I just slept. when I

woke up on the eighth day, I had never known such shame and guilt. I walked down the hall to the pay

phone. My mum is the sweetest person on the planet, and I knew this was going to break her heart. When

I heard her voice on the phone, I told her where I was . She just said : "son, don't you know you can't do

anything to make me not love you?"

     Her words gave me the strength to face my trouble. And I also realized this was my chance to start a

new life.

     When people know my story, I hope they will not make the same mistake as I have, but I do know that

you can overcome almost anything, especially drug abuse. That's why I share my story here.

1. Which was the writer's favorite music when he was in his teens?

A. Rock music    

B. Classical music    

C. Jazz music  

D. Country music

2. How long was the writer addicted to drug?

A. About half a year    

B. About one year    

C. One and a half years  

D. Two years

3. The writers was put into prison most probably because he _____.

A. offered others drugs  

B. took drugs

C. stopped working with a record company

D. refused to pay off all his debts

支持( )的数据库管理系统被称为关系系统。

A．关系模型

B．系统模式

C．关系定义

D．关系分类

冷凝器的作用是将压缩机排出的（）制冷剂（）通过冷凝器的外壁和翅片传给（）。