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【浙大2012-2013春夏】欲构成999(十进制数)的计数器,至少需要3片4位二进制加法计数器芯片。
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2019年6月B级听力真题[音频]Section A (1’*7=7%)Directions: This section is to test your ability to give proper responses. There are 7 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should write down the corresponding letter on the Answer Sheet.1. A. Yes, I ’m.C. Sit down, please.B. Don’t mention it.D. Let’s go now.2.A. Never mind.C. Sure, I willB. All right.D. Yes, it is3．A. Nice.C. Sure.B. I think so.D. Yes, please.4．A. Take it easy.C. Not at all.B. No, thank you. D. See you later.5．A. Take care.C. Here you are.B. Go ahead.D. No problem.6． A. Very nice.C. Glad to meet you.B. Mind your head.D. Quite convenient.7． A. See you again.C. Don’t worry.B. I’d love to.D. Don’t be late.Section B (1’*7=7%)Directions: This section is to test your ability to understand short dialogues. There are 7 recorded dialogues in it. After each dialogue, there is a recorded quest ion. Both the dialogues and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should write down the corresponding letter on the Answer Sheet.8. A. She is an operator.C. She is a doctor.B. She is a nurse.D. She is a driver.9. A. To go to study abroad.B. To move to another city.C. To pay for her debt.D. To raise money for her business.10. A. A new product design.B. After-sales service.C. The pay raise.D. The sales plan.11. A. Book a ticket.C. See a doctor.B. Place an order.D. Reserve a room.12. A. Having an interview.B. Doing an experiment.C. Discussing a new design.D. Planning a budget.13. A. On TV.C. From a magazine.B. In a job fair.D. Online.14. A. She is over the speed limit.B. She is on the wrong way.C. She is making a phone call.D. She is smoking while driving.Section C (1’*5=5%)Directions: In this section, there are 2 recorded conversations. After each conversation, there are some recorded questions. Both the conversations and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should write down the corresponding letter on the Answer Sheet.Conversation 115. A. To change an order.B. To ask for leave.C. To cancel an appointment.D. To apply for a job.16. A. 80B. 100C. 118 D. 180Conversation 217. A. A sun hat.B. A T-shirt.C. Sports shoes.D. Sun glasses.18. A. He is the manager of the store.B. He is one of her friends.C. He is a regular customer.D. He is a new customer of the store.19. A.140 dollars.B. 200 dollars.C. 240 dollars.D. 300 dollars.Section D (1’*5=5%)Directions: In this section you will hear a recorded short passage. The passage is printed in the test paper, but with some words or phrases missing. The passage will be read three times.During the second reading, you are required to put the missing words or phrases on the Answer Sheet in order of the numbered blanks according to what you hear. The third reading is for you to check your writing. Now the passage will begin.Thank you very much for meeting with me yesterday about our project. I really appreciate your help. And we’ll take your suggestions into consideration when we __20____ for the next year.It was __21____ to have someone like you who has had experience with similar projects.I appreciate your taking the time out of your busy schedule to __22____ me.I’ll ___23___ to send you a follow-up when this project is completed. Please let me know if I can __24__ the favor and when.
无线电波的速率为c,波长为λ,频率为ƒ,三者之间的正确关系是。
信号频率的高低是相对的，音频信号和视频信号都可被认为低频信号。
农药产品的特殊性在于（ ）。
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