题目内容

叠加定理仅适用于线性电路，戴维宁定理既适用于线性电路也适用于非线性电路

A. 对
B. 错

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关于替代定理，以下说法正确的是

A. 替代定理既适用于线性电路，也适用于非线性电路
B. 电路中某支路的电流2A，电压4V，根据替代定理既可以2A电压源置换该支路，也可以用4V电压源置换该支路，则说明2A电流源与4V电压源是相互等效的。

1. In addition to your wage, is provided.A. marineB. certificateC. accommodation D. base2. Would you be to help me for a few hours this weekend?A. going B. needingC. willingD. asking3. We should teach our children to pick litter when they see it on the street.A. upB. overC. backD. by4. All of our workers are to wear safety boots before they enter the factory.A. wantedB. needed C. required D. said5. Please be careful with this old book. It’s quite .A. baseB. marineC. valid D. fragile6. I’m afraid that’s not a form of ID.A. validB. fragile C. protected D. willing7. On the last day of our holiday, we went shopping for .A. certificate B. souvenirsC. marineD. accommodation8. You will be given a when you finish the course.A. breeding B. certificateC. handicraftD. community9. If you’re looking for something to do in your free time, why don’t you ?A. volunteerB. volunteeringC. volunteersD. volunteered10. You can recognize the people who work for us, as they all wear .A. badges B. basesC. bamboo D. breeding

1. By the year 2050, most children (teach) online, so they can learn at home.2. These clothes (make) from environmentally friendly materials.3. Last week, my house (flood) because of the heavy rain.4. Please take your litter home. It (should not, throw) on the ground.5. Every day, all over the world, animal habitats __ (be, lose).

Last summer, my friends and I organized a (1) _______ (required/support/fund-raising) event to raise money for my local animal shelter. We knew that the shelter needed some (2) _ (support/possess/valid) and we really wanted to make a difference. We booked our (3) _ (community/shelter/marine) hall and my friend, who is a really good baker, made some delicious cakes. Another friend made tea and coffee, and a local artist agreed to sell some of his (4) _ (badges/causes/handicrafts) to raise some extra money. The event was a great success. Over 100 people came along and many of them made some very generous (5) _________ (causes/support/donations). It felt so good to give something back to our community and to help a cause which we felt strongly about.