哪类人群不是生殖道感染的易感人群？（）A.青少年（女性） B.多个性伴侣 C.长期使

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     I had a summer camp with my classmates last year.

     Early in the morning, we gathered at the bus station. After saying goodbye to our parents, .we got on the buses. It

took us more than two hours to arrive at the camp ground.

     We got off the buses cheerfully. Laughing and shouting, we jumped and ran all over the place. It was the first time

for us to be away from the parents. Some of us started to feel homesick. However, when the night party and dances

began, the homesickness was gone.

     The next day, everybody rushed to the boating class, hoping to be at the head of the others. At first, my friends and

I worked hard, but the boat wouldn't listen to us and kept going round and round. Then the teacher taught us how to

work together. After many tries, we did much better.

     Swimming class was my favourite. It was about the hottest time of a day and the best time to stay in the cool water.

The swimming teacher was a funny man, and during the class he often made us laugh happily.

     During the week I learned a lot of new things and made many new friends. I also learned how to take care of myself.

1. They got to the camp ground _____.

A. on foot

B. by bike

C. by bus

D. by plane

2. The camp ground was _____ from their homes.

A. quite near

B. not far

C. very long

D. quite far

3. Why swimming class was the writer's favorite?

A. Because it was good to stay in the cool water when the weather was hot.

B. Because the writer felt quite relaxed during the class.

C. Because the swimming teacher was interesting.

D. Because of all the above.

4. Which statement is NOT true?

A. The children were happy to be away from Dad and Mum.

B. Their homesickness lasted for long.

C. It was teamwork to boat.

D. They camped for a week.

5. Which is the best title for the passage?

A. I Learnt a Lot.

B. Boating and Swimming.

C. On the Camp ground.

D. My First Summer Camp.

逐点比较法的插补原理可概括为“逐点比较，步步（）”。

A.逼近

B.计算

C.模拟

D.插补

举例说明粗糙度对润湿与粘附强度的影响，并说明原因。

盛满水的容器，顶口装有活塞A，直径d=0.4m，容器底的直径D=1.0m，高h=1.8m，如图6-19所示。如活塞上加力2520N（包括活塞自重），容器底的总压力为（）。

A.20.9kN

B.29.6kN

C.37.7kN

D.17.6kN

汽轮机负荷未变化而发现转子轴向位移增加时的处臵步骤？