如图所示,在水平课桌上放一本书。下列哪两个力是一对平衡力 [ ] A.书对地球的

题型:选择题

问题:

如图所示,在水平课桌上放一本书。下列哪两个力是一对平衡力

[ ]

A.书对地球的吸引力和书的重力

B.书所受的支持力和书对桌面的压力

C.书所受的支持力和书的重力

D.书的重力和书对桌面的压力

考点:平衡力与平衡状态
题型:选择题

阅读理解。

      On a Friday night, a poor young violinist (小提琴家) was playing his violin at the entrance of the subway

station. The music was so great that people slowed down to listen and put some money into his hat.

     The next day, the violinist came to the entrance again. He put down his hat as usual. Beside the hat was a

piece of paper with some words on it. It said, "A George Sang has put an important thing into my hat by mistake. Welcome to claim (认领) it." Soon the people were all attracted by the words and wondered what it could be.

After a while a man rushed through the crowd, took the violinist's shoulders and said, "I knew you would

certainly come here." The violinist asked, "Did you lose something?" "Lottery ( * * )." The violinist took out a

lottery ticket with Sang's name on it and danced happily.

     Sang was an office worker. He bought the lottery and won a prize of $500,000.But when he gave $50

to the violinist for his wonderful music, the lottery ticket was thrown in, too. The violinist was a college

student. That morning, he was going to fly to Vienna for high-education. However, when he found the ticket,

he cancelled the flight and retuned to the entrance.

      Later someone asked the violinist why he didn't take the lottery ticket to pay the tuition fee (学费). He said

"Although I don't have much money, I live happily. If I lose honesty, I won't be happy forever."

1. The young man played the violin for ______ at the entrance.

A. pleasure

B. money

C. love

D. friends

2. George Sang put ______ into the violinist's hat on a Friday night.

A. money

B. lottery

C. money and lottery

D. nothing

3. George Sang was very ______ to see the young violinist the next day.

A. worried

B. sorry

C. sad

D. happy

4. The underlined word "cancelled" means ______.

A. 取消

B. 延误

C. 预定

D. 结束

5. What's the best title (标题) for this passage?

A. The meaning of honesty

B. An office worker and a lottery ticket

C. The importance of being honest

D. A violinist and an office worker

题型:选择题

下列情况一般血浆AG增加,但有哪一种例外()。

A.乳酸性酸中毒

B.糖尿病酮症酸中毒

C.呼吸性酸中毒

D.代谢性碱中毒

E.低蛋白血症

题型:选择题

一个杠杆在两个力的作用下处于平衡状态,则下列说法中正确的是(  )

A.这两个力的大小一定相等

B.这两个力的力臂一定相等

C.力臂较长的那个力较大

D.两个力和各自力臂的乘积一定相等

题型:选择题

审核林木发放采伐许可证的部门,所发放的林木采伐许可证准许采伐森林和林木的总量,不得超过()。

A.上年度采伐总量

B.本地区更新造林的总量

C.年森林采伐限额

D.当地的平均采伐量

题型:选择题

对下列渔业行政主管部门的行为,不可以申请行政复议的是()

A.渔业行政主管部门对渔民张某和刘某之间的民事纠纷作出的调解;

B.渔业行政主管部门将执法人员小张调离执法岗位;

C.渔业行政主管部门扣押了渔民王某的渔船;

D.渔业行政主管部门制定了渔业管理工作规范。

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