问题 选择题
如图所示,是合川中学某实验小组制作的一个可调节亮度台灯原理图,其特别之处在于可以实时查看电流大小.一个标有“6V 3.6W”字样的小灯泡L和最大阻值为50Ω的滑动变阻器R串联后接在电源电压U恒为6V的电路中,设灯泡电阻不变,则下列判断正确的是(  )

A.无论如何移动滑片P,电路中总功率不会超过2W

B.移动滑片P,电路中总功率最小值为0.6W

C.当滑片P由a滑向b的过程中,滑动变阻器两端的电压变大

D.当滑片P由b滑向a的过程中,灯泡L越来越亮

答案

答案:B

问答题 简答题
阅读理解

Companies can increase the money with which they run their business in a number of ways. One way is borrowing money, and another way is buying things with the agreement that payment would be made later. There are also other processes for providing money for use by a company. Two of these processes are described here.

One process the company may use is to issue bonds(债券). Bonds are a special kind of promissory note. They are issued in different values, in the forms of money used in different countries, such as the pound in England or the euro in Europe. These bonds can easily be sold again to other people or to other companies. The company that issues the bonds promises to pay a particular amount of money as interest regularly for a certain period of time. This continues until when the company has to pay back the principal(本金) of the bond. Payments of principal and interest must be made on time whether the company has been earning money or not. If these payments are not made on time, it means that the company has not done what it agreed to do and can be sued(控告,起诉).

Another process companies may use is to issue other forms of promissory notes called stocks(股票). Bonds and stocks are opposite methods of providing money for a company. The people who buy stocks provide money that is earned and take part in deciding how the company will conduct its business. They must also take part in the losses. The people who own stocks receive dividends only after the company has paid all of its debts to the people who own bonds. On the other hand, the persons who own bonds have no right, according to the law, to help decide how the company will handle its business, unless it is bankrupt or in danger of becoming so.

1. Which of the following statement is not the way for companies to increase their capital?

A. Borrowing money.                                   B. Buying materials without paying.

C. Issuing bonds                                       D. Issuing stocks

2 As to bonds, we know from the passage that ________.

A. they are cheques like bank notes                   

B. the company only pays back the principal

C. they are issued in the forms of money   

D. if a company is bankrupt, it needn’t pay back the interest

3. According to this passage, who have the legal control over the decisions of the business?

A. Stockholders                                          B. Bondholders     

C. The government                                       D. The workers in the company

4. It can be inferred from this passage that ________.

A. to issue bonds is a better way than to issue stocks

B. stockholders can sue the company when it is bankrupt

C. bondholders have the same rights as stockholders

D. investing in stocks has more risk than in bonds