【填空题】若图示两电路等效，则Is=（）A，Rs=（）Ω。 [图]...

填空题： 若图示两电路等效，则Is=（ ）A，Rs=（ ）Ω。

【单选题】若图示两电路等效，则Is=（）A，Rs=（）Ω。

A、2；2

B、2；4

C、1.5；4

【填空题】In fact, （1） is not a simple product like your （2）. It is a kind of （3） that makes something else more （4）. For example, suppose you have a （5） of written directions for getting to the bank. Now imagine you have a mapping （6） that you could use to pinpoint where you （7） to go (the bank). Not only could that （8） print out detailed （9） of how to get to the bank, it could also display a full-color image of a map to the bank, along with a brief （10） segment telling you the traffic conditions on the roads around the bank.

【填空题】The （1） system is, in fact, its own network. To the（2） and application process this translation is a （3） provided either by the local （4） or from a remote host via the （5）. If one DNS server (or resolver) doesn't know how to （6） a particular domain name, it asks another one, and so on, until the correct （7） address is returned. The DNS was originally introduced in the United States of America and the final （8） of an address was intended to indicate the （9） of organization hosting the computer. Some of the three later final （10） (edu, gov, mil) are still only used by organizations based in the USA. Others can be used anywhere in the world.

【单选题】如图所示电路，戴维南等效电路正确的是 。

A、Ro=R1+R2//R3

B、Ro=R1+R2

C、Uoc=isR2

D、Uoc=-is(R2+R3)

【填空题】Reading A 练习题 Task 2 Complete the sentences with the correct form of the words in Task 1. 1. Our national ________ are no worse than those foreign ones! 2. Our launch of the new cell phone was a success. We already have orders from seven __________ stores. 3. Several __________ of the school have voiced their opinions on the new project. 4. He is not sure whether it is right to move the company’s ______________ to Thailand. 5. The unsold ____________ will be removed from the shelves in the supermarket by the end of this season. 6. He has _________ our restaurant with a variety of fruits and vegetables for five years. 7. Our path to success is to keep a close __________ with other factories. 8. The company is trying to _________ the material from manufacturers outside Japan.

图示电路对外电路来说可以等效为（ ）。

A、理想电压源US

B、理想电流源IS

C、理想电压源US与电阻R串联

D、理想电流源IS与电阻R并联

【填空题】Monica is _______ to think so, on both ______. Now a 40-year-old mother of four, she is president of a public sector labor union with 45,000 members. "______ with my employees are probably different from those of male managers ______ me," she says. "I know what it's like to have to call and say my kid got the _______ so I won't be coming in. I have a more ______ style - not soft, just more understanding." The man who is Monica's ______ agrees, "She tends to ______ more and is always looking for a _______. People are happy and flourish because they have an input into decisions and they are not mere ______; their energies are harnessed. On the other hand, consensus takes longer."

图示电路中，已知：Us=4V，Is=3A，R1=R2=1Ω，R3=1Ω，则根据戴维宁定理求取电流I时，等效电源的电压和内阻分别为（ ）。

A、5V，1.5Ω

B、5V，2Ω

C、6V，1.5Ω

D、5V，1Ω

图示电路中，IS>0、US>0，则吸收功率的元件是

A、电压源

B、电流源

C、无法确定

D、都吸收功率