车身导轨面严重磨损后，车削工件会产生（）。 A.平行度 B.圆度 C.锥度 D.圆柱

阅读理解.

     Hundreds of years ago there lived a king in a small country. He liked swimming. When summer came,

he always went to another palace by a forest with his guards and returned to the capital in autumn.

     One afternoon the king went swimming in a river in the forest but he didn't tell others about it. He was

very happy when he swam in the water. After that he heard a great noise and saw a big bear coming at

him. He tried his best to run away. He ran and ran and at last he lost his way. He was hungry and tired

when he found an old house. There was an old farmer in it. "It's your king," he said to the old man. "I'm

hungry now. Bring me something to eat quickly!"

     The old man had nothing dear. He only had four eggs. The king ate them and felt better. "How much

must I pay you for that?"

     "Eighteen pounds."        

     "How dear they are! Are eggs rare(稀有的)here?"

     "No," answered the old farmer. "We have only one king in our country!"

1. _____, he was happy.

    A. The river was beautiful

    B. He was swimming in the water

    C. The water was warm

    D. The king could swim for a long time

2. When the king saw the bear, he _____.

    A. asked the old farmer to help him

    B. cried for help

    C. ran away quickly

    D. ran outside the forest

3. At last the king found _____.

    A. an old house

    B. his guards

    C. his capital

    D. the bear

4. The king felt better because _____.

    A. he could sleep in the farmer's house

    B. the bear couldn't find him

    C. he ate four eggs

    D. the farmer knew he was a king

5. Which is the best title of the story?

    A. The King and the Old Farmer

    B. The King in the Forest

    C. The King and the Bear

    D. The Kind hearted King

机车轴瓦是（）轴承。

A、滚动轴承

B、滑动

C、推动

D、含油

某药品生产企业正在研发一种新药，此时该新药经批准后已进入了临床试验阶段。 上述临床试验的病例数（）。

A.为20～30例

B.不少于50例

C.不少于100例

D.不少于300例

发电企业的（）、（）禁止作为工程的发包方向外发包工程项目。

坚持和确立健康行为阶段的干预手段是（）

A.传播

B.指导

C.督促

D.巩固

E.鼓励