在如图所示的实验装置中，用棉线将铜棒ab悬挂于磁铁N、S极之间，铜棒的两端通过导线连接到电流表上。当ab做切割磁感线运动时，能观察到电流表的指针发生偏转。这一现象是英国物理学家 首先发现的，利用这一现象所揭示的原理，可制成的设备有 。 
法拉第 发电机
题目分析：：（1）产生感应电流的条件：闭合电路的一部分导体在磁场中做切割磁感线运动，电路中产生感应电流．铜棒向左运动时，符合产生感应电流的条件，电路中有感应电流产生，灵敏电流计的指针发生偏转．这一现象是英国物理学家法拉第首先发现的，
（2）铜棒运动时，具有机械能，产出感应电流时，电路中具有电能，产生感应电流的过程是机械能转化为电能的过程．
（3）根据电磁感应制成了发电机．
所以答案为：法拉第、发电机．
点评：（1）图中所示是电磁感应实验的装置，图中电流计是否发生偏转反映了是否有感应电流产生．
（2）在电磁感应现象中，机械能转化为电能．
（3）发电机的根据电磁感应原理制成的．
| 阅读理解。 |
| A good cell phone policy should be a required part of any company. It not only covers liability (法律责任) issues, but also covers many other legal and financial challenges that might cause you problems. For instance, there is an IRS guideline that requires company cell phones to be used only for business purposes. Personal use of these devices is considered as a taxable benefit, which can be considered as part of your income and therefore must be included in the income to be declared for tax. Then how to make a good cell phone policy? Here are some tips for you to follow. Make sure there are provisions (条款) in your cell phone policy for business and personal use. You must make it clear what is allowed and what is not. A good Cell phone policy should clearly show your managers and employees the company-wide rules for cell phone usage. This will avoid some managers making their own decisions. Employees should understand that cell phones are controlled not by them, but by a company authorized (公司批准的) employee who is the only person authorized to order devices, assign plans, manage devices and the like. This will prohibit employees from ordering whatever services they want. Another mobile device issue is liability for damage (赔偿责任). A good cell phone policy also states responsibility for lost or damaged phones and how to report problems. This will prevent confusion and help keep costs under control. Once you have a company cell phone policy in place, make sure you read and discuss it thoroughly with all of your employees. Have them sign the policy to ensure that they understand the information contained within. Be sure to provide employees with a copy of the policy. This will help reduce your company's liability for any legal issue that may arise. |
| 1. According to the IRS guideline, an employee will ______. |
| A. pay more tax if he doesn't use a company cell phone B. pay more tax if he uses a company cell phone for business purposes C. pay less tax if he uses a company cell phone for personal purposes D. pay more tax if he uses a company cell phone for personal purposes |
| 2. A company cell phone policy should ______. |
| A. allow some managers to make their own decisions B. be discussed and signed by all the employees of the company C. be provided for employees in copies to make sure they understand it D. prohibit employees from ordering any kind of service they want |
| 3. Which of the following is the best title of this passage? |
| A. Why a company needs a good cell phone policy? B. How to make a good cell phone policy? C. Reasonable rules are necessary in running companies. D. Ways to make companies run well. |