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【简答题】
硅稳压管起稳压作用时工作在( )区。 A 、正向导通区 B 、反向截止区 C 、反向击穿区 2. 常温下,硅二极管的正向导通压降为( )。 A 、 0.3V B 、 0.7V C 、 1V 3. 常温下,锗二极管的正向导通压降为( )。 A、 0.3V B 、 0.7V C 、 1V 4. 由于稳压管工作在反向击穿区,所以稳压管在电路中应( ) A 正向连接 B 反向连接 C 正反向连接均可
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【简答题】在计算机的外部设备中,除外存储器:软盘、硬盘、光盘和磁带机等外,最常用的输入设备是键盘、____。
【单选题】--- ______? --- I’ve never been there but I hope to go there in the future.
A.
Have you been to America
B.
Where are you going for holiday
C.
What did you do last week
【简答题】I've never been to Beijing, but it's the place __?I've never been to Beijing, but it's the place _______. A) where I'd like to visit B) in which I'd like to visit C) I most want to visit ...
【单选题】听力原文： It is believed that the hot dog was born in Germany. Its creator, a German butcher named Johann Georg Lahner developed its prototype first in Frankfurt, a German city, hence frankfurter as its n...
A.
The name of a dog.
B.
The name of a flavoring (调味品).
C.
The name of a person.
D.
A way of cooking.
【单选题】Many housewives prefer to buy meat in the supermarket rather than at for the sake of safety.
A.
butcher’s
B.
the butcher
C.
the butche r ’s
D.
the butchers’
【单选题】下列叙述中，不正确的一条是______。
A.
硬盘在主机箱内，它是主机的组成部分
B.
硬盘属于外部存储设备
C.
硬盘既可做输入设备又可做输出设备用
D.
硬盘与CPU之间不能直接交换数据
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