为保证汽轮机顺利启动，要尽可能减少（）和热应力，并缩短启动时间 A.弹性变形 B.塑

对给定的回路图中不可能再分的最简单回路叫（）。

This is the place for you to come to share stories with other real kids who are trying hard to improve their bodies and minds! Did you score a goal in your soccer game? Have you got rid of a bad habit? Are you working to reduce your stress in life? Tell the world what makes your body and mind healthy!

Posted by DP, Ohio

I have been working on a fitness equipment to exercise for over four months. I have completed my goal of losing weight and I am very proud of myself. That is so cool!

Posted by MK, Missouri

I was always tired at school, because I used to stay up late watching TV. I even fell asleep one day in my history class, and when I woke up, the teacher was looking at me and laughing! I decided that minute to start going to bed on time. It’s kind of a drag missing the shows I like, but I can tell my body loves it----I feel so much better.

Posted by SP, Georgia

Last year , I didn’t make the soccer team at school. I didn’t want to try out again this year, but a few weeks before tryouts(选拔赛), I started kicking the ball around and practicing. When tryout day came, I decided to give it another shot. Guess what? I made the team!

Posted by JS , New York

I’m deaf, so I’ve had more trouble playing sports than other people. But who wants to sit at home all the time? I like to play basketball with guys in my neighborhood. I can’t hear the ball bounce(弹起) or listen to the guys call plays, but I’ve taught them to use some sign language, and so far, we’ve been unstoppable.

小题1:The kids mentioned in the text came here _______.

A．to talk about their efforts to keep fit

B．to learn to tell stories

C．to make new friends

D．to share weight-losing experiences小题2:The achievement that SP, Georgia has made is that ____.

A．his soccer skills have improved a lot this year

B．he scored a goal in an important soccer match

C．he helped the school soccer team win an important match

D．he was admitted to the school soccer team小题3:Who taught other kids sign language?

A．DP, Ohio

B．MK, Missouri

C．SP, Georgia

D．JS, New York

世界古代史上曾出现过数个地跨欧亚非三洲的大帝国，其中最早出现的帝国是

A．波斯帝国

B．罗马帝国

C．亚历山大帝国

D．东罗马帝国

冷态启动时，转子表面与汽缸外壁同时受到热压应力。

各种有机宝石（珠宝）的主要化学成分均为有机质。