内悬浮内（外）拉线抱杆分解组塔时，提升抱杆宜设置两道腰环，且间距不得小于（）m，以保

阅读理解。

     When I was an educational official in Palo Alto, California, Polly Tyner, the president of our

school board, wrote a letter that was printed in the Palo Alto Times. Polly's son, Jim, had great

difficulty in school. He was classified as educationally disabled and required a great deal of

patience on the part of his parents and teachers. But Jim was a happy kid with a great smile that

lit up the room. His paront8 acknowledged his academic difficulties, but always tried to help him

see his strengths so that he could walk with pride. Shortly after Jim finished high school, he was

killed in a motorcycle accident. After his death, his mother submitted (提交) letter to the newspaper.

     Today we buried our 20-yeer-old son. He was killed instantly in a motorcycle accident on

Friday night. How I with I had known when I talked to him last that it would be the last time. If I

had only known I would have said, "Jim, I love you and I'm very proud of you"

     I would have taken the time to count the many blessings he brought to the lives of the many

who loved him. I would have taken the time to appreciate his beautiful smile, the sound of his

laughter, hit genuine love of people.

     When you put all the good qualities on the scale and try to balance all the irritating phenomena

such as the radio which was always too loud, the haircut that wasn't to our liking, the dirty socks

under the bed, etc., your angry feelings won't amount to much.

     I won't get another chance to tell my son all that I would have wanted him to bear, but, ether

parents, you do have a chance. Tell your young people what you would want them to hear if you

knew it would be your last conversation. The last time I talked to Jim was the day he died. He

called me to say, "Hi, Mom! I just called to say I love you. Got to go to work. Bye." He gave me

something to treasure forever

     If there is any purpose at all for Jim's death, maybe it is to make others appreciate more of life

and to have people, especially family members, take the time to let each other know just how much

we care.

1. Accosting to the passage, we know that ______.

A. Jim kept to himself                

B. Jim did very well in his studies

C. Jim a parents were patient with him    

D. Jim failed to finish his high school

2. By writing the letter printed in the Pain Alto Times, the author intends to ______.

A. mourn her son's sudden death in a traffic accident

B. remind people to be cautious of motorcycles

C. advise people to take the chance to express their love in time

D. appreciate more of life than ever before

3. What can be the best title of the passage?

A. Love your Family.                  

B. Do it Today.

C. Walk with Pride.                    

D. Appreciate Smiles.

4. The underlined word "irritating" in Paragraph 4 means ______.

A. annoying

B. aggressive

C. impatient

D. thrilling

光栅两线纹之间的距离称为（）。

A.线纹密度

B.光栅分辨率

C.相位光栅

D.栅距

以下哪点不属于变频杀菌技术的特点（）。

A.杀菌效率高，70%以上

B.投资、运行、维护费用较低

C.兼有除垢作用

D.兼有破乳作用

竞争是一把双刃剑，既可以提高学生学习的效率，也可能会造成一系列不良的结果。下列属于竞争直接导致的不良后果的是（）

A、思维僵化

B、压力过大

C、习得性无助

D、人际关系紧张

腹部受暴力冲击后突发剧烈腹痛，应首先想到的是（）

A.胆石症

B.肝脾破裂

C.胃肠穿孔

D.异位妊娠破裂

E.肾结石