问题
单项选择题
在以下四种情况中使稳压电源输出电压下降的是（）
A.稳压二极管断路
B.稳压二极管击穿短路
C.调整管击穿
D.比较放大管断路
答案
参考答案：B
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在以下四种情况中使稳压电源输出电压下降的是（）
A.稳压二极管断路
B.稳压二极管击穿短路
C.调整管击穿
D.比较放大管断路
参考答案：B
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| It’s Saturday. Han Ling has no classes today. She wants to buy a new dress. Her 1 is at work, 2 she is going to the shop with her father. Her father drives her to the shopping mall in his own car. But her father doesn’t like going 3 , so Han Ling does the shopping and her father sits in the 4 and waits for her. There are a lot of people in the shop. It is very crowded (拥挤). Han Ling looks at the clothes and 5 from them. Her father waits and waits. About an hour goes by (流逝). Han Ling doesn’t 6 out. Her father is worried about her. “Why does she stay in the shop for so long?” He comes out of the car. Just then (正在这时), a man comes up to him. “Excuse me. Are you Han Ling’s father?” “Yes.” “Han Ling is waiting for you. She doesn’t have enough 7 .” “Oh, I see.” Then he 8 the man into the shop. Han Ling is very 9 to see her father. She chooses a nice green dress. After her father 10 the money, they go home together. | ||||
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