
通风机噪声的控制方法有()。
A . 降低声源的噪声
B . 传输路径的噪声控制
C . 接收器的防护措施
D . 降低转速


A . 降低声源的噪声
B . 传输路径的噪声控制
C . 接收器的防护措施
D . 降低转速
Listen to the conversation again and fill in the blanks.
Doctor: Good morning, Mr. Lopez. How can I help you?
Mr. Lopez: Hello, doctor. 1. _____________, but when I go to bed 2. __________.
Doctor: OK. How long have you had this problem?
Mr. Lopez: Since I started my new job.
Doctor: What do you do?
Mr. Lopez: I’m 3. ___________.
Doctor: How many hours do you work?
Mr. Lopez: I work about 80 hours a week.
Doctor: 80 hours! That’s a lot. And how much exercise do you get?
Mr. Lopez: Not much. I don’t have the time.
Doctor: OK. It seems to me that you are 4. __________. You need to 5. ________ and find time to 6. _______________. Maybe you should look for a more 7. ____________.