半导体二极管的重要特性之一是__________。
A. 温度稳定性
B. 单向导电性
C. 放大作用
D. 滤波特性
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Why was Dora late?
A. She didn't know the time.
B. She forgot her class.
C. She didn't catch the bus.
二阶压控电压源低通有源滤波器通带外幅频响应曲线的斜率为_________。
A. 20 dB/十倍频程
B. -20 dB/十倍频程
C. 40 dB十倍频程
D. -40 dB/十倍频程
What is the man's problem?
A. He has to find two jobs to support himself.
B. He can't decide whether to take a science course or not.
C. He can't study full time this year.
1931年英帝国通过了《威斯敏斯特法》,其主要内容是()。
A. 承认自治领在内政外交上独立自主,与英国同为英帝国的平权成员
B. 承认南爱尔兰脱离英帝国统治
C. 在英帝国内实行互惠关税
D. 英国正式改名为“大不列颠及北爱尔兰联合王国”