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听力原文:M: And now, Mrs. Smith, can you tell us what happened at your apartment when the earthquake ended? W: Oh, it was terrible. I'll never forget it. Well, Jack and I always get up at about a quarter to five. He has to work early. You see, while I was in the kitchen preparing breakfast, the quake came. There was this horrible sound and the floor was just bouncing and rolling like wave, all at the same time. M: Then what did you do? W: Well, we figure out it was an earthquake. Then I crawled under the table, and I shouted at Jack to come. But he just stood there. M: Whoa! W: It lasted 24 seconds, and then it stopped. And Jack and I could hear people talking outside, so we tried to go out to the front door, but it was jammed shut. And then the first aftershock hit. M: That's incredible. Then what did you guys do? W: Well, I remember that someone shouted, 'Get out of there, quickly!' Jack said: 'Well, go out of the window.' But I called out: 'It's too high up,' because we were living on the second floor. 'Not any more,' Jack shouted back. So, we looked out of the window and, sure enough, we were down on the ground! M: Your second floor apartment was on the ground? W: We couldn't believe it. We opened the window and crawled out. Once we were down safely, we turned around and looked back at our apartment building. The whole first was gone -- it was just totally flattened. M: Mrs. Smith. Do you mean that the whole first floor was gone? W: Yes, the first floor was gone. M: And what about your apartment? W: The apartment -- can you believe it? Had moved and stood there. M: Incredible, Mrs. Smith, absolutely incredible. (23)
A.
5:15.
B.
4:45.
C.
5:45.
D.
4:15.
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【简答题】在厂矿企业内部的供电线路,1000V以下的为低压线路。工作电流小于30A的电路采用______。
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【单选题】文件按其数据的组织形式可分为 [填空(1)]、[填空(2)]
A.
C 语言使用的磁盘文件系统有两大类 : 一类称为 [填空(1)] 系统,另一类称为 [填空(2)] 系统。
B.
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使用 [填空(1)] 方式打开的文本文件只能用于向该文件输出 ( 写入 ) 数据,而不能用于从该文件中读取数据。
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A.
输入信号过大
B.
β 值太大
C.
电源电压太高
D.
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【单选题】在互补对称功率放大电路中,引起交越失真的原因是( )。
A.
输入信号过大;
B.
晶体管的 β值太大
C.
晶体管的非线性
D.
电源电压太高。
【单选题】在互补对称功率放大电路中,引起交越失真的原因是 ( ) 。
A.
输入信号过大
B.
晶体管β值过大
C.
电源电压太高
D.
晶体管的非线性
【单选题】在互补对称功率放大电路中,引起交越失真的原因是( )
A.
输入信号过大
B.
晶体管β值太大
C.
电源电压太高
D.
晶体管输入特性的非线性
【单选题】在互补对称功率放大电路中,引起交越失真的原因是( )。
A.
输入信号过大
B.
晶体管β值太大
C.
电源电压太高
D.
晶体管死区电压
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