问题
单项选择题
对于三端子反向阻断晶匣管，当在（）的微小脉冲信号时，从阳极到阴极就有电流通过。否则，没有电流通过。
A、控制极、阴极之间加入正向
B、控制极、阳极之间加入正向
C、控制极、阳极之间加入反向
D、控制极、阴极之间加入反向
答案
参考答案：A
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对于三端子反向阻断晶匣管，当在（）的微小脉冲信号时，从阳极到阴极就有电流通过。否则，没有电流通过。
A、控制极、阴极之间加入正向
B、控制极、阳极之间加入正向
C、控制极、阳极之间加入反向
D、控制极、阴极之间加入反向
参考答案：A
 This is love, hand in hand with you, old age to the old. I made a promise to myself on the way down to the vacation beach cottage. For two weeks I would try to be a(an) 31 husband and father. Totally loving. No ifs, ands or buts. The 32 had come to me as I listened to a talk on my car radio. The 33 was quoting Biblical passage about husbands and their wives. Then he went on to say, “Love is an 34 of will. A person can choose to love.” To myself, I had to 35 that I had been a selfish husband. Well, for two weeks that would 36 . And it did, 37 from the moment I kissed Evelyn at the door and said, “That new yellow sweater looks 38 on you.” “Oh, Tom, you noticed,” she said, 39 and pleased. Maybe a little puzzled. 40 the long drive, I wanted to sit and read. Evelyn 41 a walk on the beach. I started to refuse, 42 then I thought she wanted to be alone with me.” We walked on the beach while the 43 flew their kites. So it went. Two weeks of not calling the firm where I am a director. We visited the shell museum 44 I usually hate museums. Relaxed and happy, that’s how the whole 45 passed. I made a new promise to keep on remembering to choose love. There was one thing that went 46 with my experiment, however. Evelyn and I still laugh about it today. On the last night at our cottage, preparing for bed, Evelyn 47 me. “What’s the matter?” I asked her. “Tom,” she said in a(an) 48 voice, “do you know something? I don’t….” “What do you mean?” “Well… that 49 I had several weeks ago … our doctor … did he tell you something about me? Am I dying?” It took a moment for it all to be understood. Then I burst into 50 . “No, honey,” I said, wrapping her in my arms. “You’re not dying; I’m just starting to live.”
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