在EPON网络中，如果采用1：32分光器，OLT到ONU间的距离可以达到30KM。（

弥漫性硬化的临床特点为()

A．发病仅累及男性

B．有肾上腺萎缩

C．以视野缺损、同向性偏盲及皮质盲为最早表现

D．伴有周围神经受损

E．血中极长链脂肪酸(VLIFA)增高

阅读理解。

     John Thomas was an 18-year-old student, but he had been a famous champion. Everybody at Boston

University liked this tall, quiet boy. Once he was hurt, everybody at Boston University was sorry. People

all over the country talked about John Thomas and often asked, "Will he ever jump again?"

     John's mother went to the hospital to see her son. She looked at his broken leg. Then she looked into

his eyes. She knew what her son would do. "You're going to jump again, John. I know it," she said.

"Everything will be all right."

     If John hoped to jump again, he would have a lot to do. He began at once. Even in his hospital bed John

started to exercise. He used a wheel and other mental things. Soon his home looked like a machine shop!

     It was May when John left the hospital. "Is it all right if I go camping this summer?" He asked the

doctor.

     "Yes," the doctor said. "But take it easy on that foot."

     John took only short walks at first. He was taking it easy on his foot. But not on anything else. He went

swimming and did other kinds of exercise. He exercised until his body cried for a rest. Some days later, he

exercised a little more. In late summer John went back to hospital. He asked if he could practice with his

football team. Football wasn't his favorite, but he had to get that leg strong again! He worked hard. "No one

pushed him as hard as he pushed himself," said one of his friends. "To see a champion fighting back is a

wonderful thing to watch."

1. What was John Thomas like? [ ]

A. He liked playing football.

B. He was quiet.

C. He was tall and strong.

D. He was a champion.

2. What was wrong with him? [ ]

A. He had an accident.

B. He was ill in hospital.

C. He couldn't jump any more.

D. His leg was broken.

3. Which of the following statements is WRONG? [ ]

A. He was cared by the people all over the country.

B. He worked hard to make himself strong again.

C. He liked a machine shop very much.

D. He went camping and did some exercise there.

4. What does the underlined sentence "when his body cried for a rest" mean? [ ]

A. His body often cries.

B. When his body was very tired.

C. He makes his body cry.

D. When his leg makes him tired.

5. We can guess that John Thomas was good at ______. [ ]

A. running

B. playing football

C. jumping

D. singing

如果f（x）=x²+x+a在[-1，1]上的最大值是2，那么f（x）在[-1，1]上的最小值是 ______．

患者，女性，65岁，缺失，可摘局部义齿修复1个月后诉左下尖牙疼痛，下面说法不正确的是（）

A．下颌属于Kennedy第一类牙列缺失

B．可能无咬合接触

C．卡环可能过紧

D．牙体预备造成牙本质过敏

E．只在上放支托，基牙负担过重

企业实施物流业务外包的原因()

A.降低成本

B.提升企业效率

C.分担企业风险，提高企业的柔性

D.快速响应需求

F.企业自身的局限