主轴回转误差可分以下基本类型（）。 A.纯径向跳动 B.纯轴向窜动 C.纯角度摆动

邓 * * 关于建设有中国特色社会主义理论，要求中国必须正确处理（）、（）、（）三者的关系，为改革开放和现代化建设提供安定的社会环境。

阅读理解。

     One day, Bob took two of his friends into the mountains. They put up their tents (帐篷) and then rode

off to a forest to see the trees growing.

     In the afternoon, when they were about ten kilometers from their camp (营地), it started to snow. More

and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob

knew there were two roads. One road went to the camp, and the other went to his house.But all was white

snow. Everything was the same. How could he take his friends back to the camp?

     Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took

the road to his house? That would be a trip of thirty-five kilometers in such cold weather!

     It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them

could tell. Bob looked around. What was that under the tree? It was one of their tents!

1. Bob and his two friends went to the forest to _____. [ ]

A. build their camp

B. find their way home

C. enjoy the mountains in the snow

D. watch the trees in the forest 

2. They could not find their way back because _____. [ ]

A. there was only one road to their camp

B. they couldn't decide which of the two roads led to their tents

C. there were no roads in the mountains at all

D. everything was covered by the white snow

3. It is clear that they wanted the horses to take them to _____. [ ]

A. John's house

B. the camp

C. the forest

D. the mountains

4. The horses stopped because _____. [ ]

A. it was getting late

B. they were tired after running for a long way

C. they knew that they had got to the camp

D. they had seen John's house

男性，15岁，少尿、水肿5天，咳嗽气短不能平卧1天，起病前2周喉痛3天，血压170／110mmHg，端坐呼吸，两肺底有散在湿啰音，尿比重1．022，尿蛋白（+++），红细胞30～90个／HP，血清补体C3降低

该患者急性左心衰竭的原因是（）

A.心脏后负荷过重

B.心脏前负荷过重

C.高血压心脏病心力衰竭

D.急性肾炎致心肌损害

E.以上都不是

通常，在金融期权交易中，( )需要开立保证金账户，并按规定缴纳保证金。

A．期权购买者

B．期权买卖双方

C．期权买卖双方均不

D．期权出售者

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