装拆接地线可不使用绝缘棒或戴绝缘手套。（）

将企业价值最大化作为企业财务管理总体目标的优点有()

A、考虑了客户利益 

B、考虑了风险因素 

C、体现了企业对资产保值增值的要求 

D、有利于制约企业追求短期总的倾向 

E、保险企业运用资本获得利润的能力

（13分）如图所示，一块小磁铁放在铁板ABC的A处，其中AB长x₁=1m，BC长x₂=0.5m，BC与水平面间的夹角为37°，小磁铁与铁板间的引力为磁铁重的0.2倍，小磁铁与铁板间的动摩擦因数μ=0.25，现在给小磁铁一个水平向左的初速度v₀=4m/s。小磁铁经过B处时速率不变（sin37°=0.6，cos37°=0.8）g取10m/，求：

（1）小磁铁第一次到达B处的速度大小；

（2）小磁铁在BC段向上运动时的加速度大小；

（3）请分析判断小磁铁能否第二次到

达B处。

使用一次后即失去效能的消耗性物品是( )

A．房产

B．经费

C．办公用品

D．设备

阅读理解。

     Juanito Estrella has been a housekeeping manager on the US-based large passenger ship Carnival Spirit for

18 months and feels he has found the suitable position in his career (职业). He has always wanted to travel.

"I guess I am a really restless spirit. I like traveling, so when the chance came, I jumped at it," he says.

     The chance came in the form of a newspaper advertisement for work on cruise ships (游船). At the time

Estrella was the housekeeping manager at a Melbourne hotel. He applied and, after two interviews, a medical

check and police clearance, the job was his.

     Estrella is responsible (负责的) for the cleanliness of the ship, making sure that 160 crew work properly.

"I enjoy it because there is no other work-you wake up each day in a different place and a different culture.

It's exciting when you go to the next country and you don't understand the language," he says.

     Estrella likes being busy and getting to know people from all over the world. The 1,000 crew come from

94 countries, and Estrella has learnt Spanish and a little Croatian.

     But there is a downside. "You cannot get really drunk...because you have safety responsibilities to yourself

and others," he says. "You don't really think about home. You start to think about home only when you get

closer to your vacation and wonder what you'll be doing."

     Life on the ship is anything but cruising. Estrella and his fellows work at least 10 hours a day, seven days

a week. He warns the job is not for everybody. "You have to love being busy and be prepared to work every

day-and to give up drinking too much alcohol." In his spare time, if the ship sails into a port, Estrella explores

it, otherwise he works out in the crew's gym, goes on the internet or calls home.

1. What do we know about Estrella?

A. He is very fond of traveling.

B. He doesn't drink wine now.

C. He cannot speak a foreign language.

D. He used to be a housekeeping manager.

2. The underlined word "downside" in paragraph 5 probably means _____.

A. disappointment

B. disadvantage

C. failure

D. loss

3. Which of the following is true?

A. Estrella doesn't often feel homesick because of his work.

B. The work on the ship is not suitable for a married person.

C. Estrella can find no other job except the one on the ship.

D. The people on the ship are from 94 countries.

4. In the last paragraph, the writer thinks that life on the ship is _____.

A. not a tiring journey at all

B. just an interesting voyage

C. far from a voyage for pleasure

D. more than a pleasant travel by sea

谈谈你在教学中引导学生感悟数学思想，积累数学活动经验的一些做法。