首次提出知识产业的概念的是美国信息经济学家（）。A.斯托尼尔（T.Stonier）

按照药性升降浮沉理论，具有升浮药性的药是（）

A.重镇安神药

B.平肝息风药

C.开窍药

D.清热药

E.泻下药

阅读理解。

     Jim lives in the country. He loves playing in the river near his old house, but now his father has a job

in a big city, so he moves there with his family.

      Their new house has a garden, but the garden is very small. So Jim isn't happy. "Is there a river

nearby?" he asks his mother on the first morning. His mother answers, "No, there isn't. But there's a nice

park near here, and there's a pool in it. We are going there this afternoon." Hearing it, Jim is happy now.

      After lunch, Jim and his mother go to the park. Jim wants to walk near the pool, but there is a sign

(牌子) before it. His mother reads it to him, "Be careful! This pool is dangerous (危险的). 367 people

have fallen (掉进) into it." Jim looks into the pool carefully, and he says, "But I can't see them."

1. There is _____ near Jim's old house. [ ]

A. a country

B. a garden

C. a river

D. a park

2. Jim moves to a big city because _____. [ ]

A. he likes the big city

B. their new house in the big city has a nice garden

C. there is a pool in the garden

D. his father has a job in the big city

3. Jim becomes happy because _____. [ ]

A. he's going to the park with a pool in it

B. he's going to play in the river

C. he's going to see their nice garden

D. he's going to play with some new friends

4. The sign tells people _____.[ ]

A. the water in the pool is dangerous

B. not to walk near the pool

C. not to look at the pool

D. to take care of the pool

5. Which of the following statements is NOT right? [ ]

A. Jim's father is a worker.

B. Jim likes playing in the river.

C. 367 people have fallen into the pool.

D. Jim gets into the pool and swims in it.

一闭合线圈在匀强磁场中做匀角速转动，角速度为240π rad/min，当线圈平面转动至与磁场平行时，线圈的电动势为2.0 V。设线圈从垂直磁场瞬时开始计时，则该线圈电动势的瞬时表达式为__________________；电动势在s末的瞬时值为_________。

凝血酶原时间延长，除外的情况是

A．肝脏疾病
B．慢性肠炎
C．维生素K缺乏
D．DIC
E．口服避孕药

直流电动机的制动常采用（）、（）和（）三种方式。