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【简答题】
Ever since Jerusha started her college, she began to write letters. Through a series of letters, from freshman to senior in college, she shared her life and study with an unknown gentleman, who never wrote back. Here is the very first letter. Dear Mr. Kind, Here I am! I traveled yesterday for four hours in a train. It's a funny experience. I never rode in one before. College is the biggest, most confusing place — I get lost whenever I leave my room. I will tell you more later when I'm feeling less puzzled. Now I want to write a letter first just to get me familiar to you. It seems strange to be writing letters to somebody you don't know. It seems strange for me to be writing letters at all — I've never written more than three or four in my life, so please overlook it if they are not a model kind. Before leaving yesterday morning, Mrs. Lippett and I had a very serious talk. She told me how to behave, especially towards the kind gentleman who is doing so much for me. I must take care to be very respectful. I have been thinking of you a great deal this summer; having somebody take an interest in me after all these years makes me feel as though I had found a sort of family. It seems as though I belonged to somebody now, and it's a very comfortable feeling. I must say, however, that when I think about you, my imaqination has very little to work upon. There are just three things that I know: I .You are tall. II .You are rich. III. You hate girl. I suppose I might call you Dear Mr. Girl-Hater. Only that's rather unpleasant to me. Or Dear Mr. Rich-Man, but that's unpleasant to you, as though money were the only important thing about you. Maybe you won't stay rich all your life; But at least you will stay tall all your life! So I decide to call you Dear Daddy-long-legs. I hope you won't mind. It's just a private pet name — we won't tell Mrs. Lippett. The ten o'clock bell is going to ring in two minutes. Our day is divided by bells. We eat and sleep and study by bells. There it goes! Lights out. Good night. You can see how strictly I obey rules due to my training in the John Grier Home. Yours most respectfully, Jerusha Abbott 小题1:Which of the following is NOT the reason for Jerusha to write the letter to Mr.Kind? A.To get her familiar to him. B.To present her thankfulness to him. C.To share her brand-new college life with him. D.To apologize to him for not writing letters too often. 小题2:If Mrs. Lippett learned that the writer calls the man she writes to Daddy-long-legs, she would probably . A.burst into laughter B.think it acceptable C.criticize the writer D.inform the man 小题3:By 'when I think about you, my imagination has very little to work upon.', the writer intends to tell us that . A.the man she writes to is dull and boring B.she is not familiar with the one she writes to C.it is not interesting at all to write to a stranger D.she lacks imagination when it comes to writing a letter 小题4:Jerusha was probably while she worked on the letter. A.curious B.light-hearted C.serious D.skeptical
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【判断题】一阶RL电路的时间常数 =LR。
A.
正确
B.
错误
【判断题】流过电流继电器的电流大于动作电流时,继电器会动作;当低于返回电流时,继电器会返回。
A.
正确
B.
错误
【单选题】万向传动装置由万向节 、传动轴和( )组成
A.
中间支承
B.
万向轮
C.
轴承
【判断题】万向传动装置由万向节和传动轴组成。
A.
正确
B.
错误
【判断题】牵引车的万向传动装置由万向节和传动轴组成。( )
A.
正确
B.
错误
【简答题】其中万向传动装置由 和 组成
【单选题】一阶RC电路的时间常数是 ,一阶RL电路的时间常数是 。
A.
RC;LR
B.
RC; R/L
C.
RC; L/R
D.
R/C;GL
【多选题】一阶RC和一阶RL电路的时间常数τ与电路参数的关系分别为( )。
A.
RC电路τ=RC
B.
RL电路τ=L/R
C.
RC电路τ=R/C
D.
RL电路τ=LR
【单选题】过电流继电器的动作电流 返回电流。
A.
大于
B.
等于
C.
小于
【简答题】什么是电流继电器的动作电流,返回电流?为什么要求起动继电器的返回电流要躲过最大负荷电流?