问题
单项选择题
利用电流（）可以稳定放大电路的静态工作点．
A、负反馈；
B、正反馈；
C、放大。
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
利用电流（）可以稳定放大电路的静态工作点．
A、负反馈；
B、正反馈；
C、放大。
参考答案：A
Many people have to work 46 . Some people do not mind. Other people think it’s terrible. One man thinks that working at the weekends can be 47 . He is George Smith. Mr Smith works in an office, in Brighton, England. On Saturday, May 24, 1986, he went to the office to do some work. After he 48 the lift, it stopped between floors. Mr Smith could not get out of the lift. He began to shout, but 49 heard him. Then Mr Smith remembered that it was a holiday in England. No one was going to come to work 50 Tuesday. There was 51 for Mr Smith to do. He had to wait until one of his workmates came to work and found him. With nothing to 52 , Mr Smith was very hungry and had to sleep most of the time. Early on Tuesday morning, one of his workmates came into work and found the lift 53 . When the lift was opened, Mr Smith came out cold, weak, and tired. He had been in the lift for 54 hours! Now Mr Smith says, "I only use lifts if they have 55 in them. "
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