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【单选题】
汽车铅畜电池“自放电现象”是( )引起的。A.
电解液密度过低
B.
极板硫化
C.
电解液不纯
D.
温度变化
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【单选题】听力原文：M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought it here. M: Maybe, What is it? W: It's a new style. broom. It looks...
A.
At a department store.
B.
In a woman's laboratory.
C.
In a kitchen.
D.
At the woman's house.
【单选题】听力原文：W: Hi,Fred.What are you reading? M: Oh,these are just some books I picked up at a local poetry festival that was held a couple of weeks ago. Even though a lot of what the featured poets wrote was...
A.
Poetry is popular among the general public.
B.
People there have no interest in poetry.
C.
Poetry is the most popular literature.
D.
People have no passion for writing poems.
【简答题】在N型半导体中，自由电子是 数载流子，空穴是 数载流子。A. B.
【简答题】电路如图所示，给定R 1 =1Ω，R 2 =2Ω，R 3 =3Ω，R 4 =4Ω，α=2，要使U 5 =13V，试用回路分析确定电流源I S5 值。
【单选题】听力原文：M: Hi. I have some good news for you. W: What is it? M: The teacher suggested that we go on a trip this Saturday. W: Oh, wonderful. Where shall we go? M: How about going to the park? W: I don't t...
A.
A teacher and a student.
B.
Classmates.
C.
Father and daughter.
D.
Mother and son.
【单选题】A:( ). B:Hi. My name's Rose. Are you from London?
A.
Hello, I'm Paul. What's your name?
B.
Hello, who are you? What's your name?
C.
Where are you from?
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