题目内容

听力原文:W: Good morning, Topaz Resorts. How may I help you?
M: I'd like to book a cottage for this Saturday.
W: I'm sorry, but all cottages have already been booked for a business workshop. We can give you a reservation for the next weekend, though.
M: Please do that, then. My name is John Baxter.
Who most likely is the woman?

A cottage owner.
B. A resort employee.
C. A company executive.
D. An office assistant.

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更多问题

某电路如下图所示,开关S闭合前电路已达稳态,t=0时S闭合,电路的时间常数τ=()。

某电路如下图所示,两电源共同作用时,U2=10V,当IS单独作用时,U2将()。

A. 不变
B. 变大
C. 变小
D. 无法判定

二级管如下图所示,三个二级管的正向压降为0.5V,它们的工作状态为()。

A. 三管均导通
B. 三管均截止
C. VD1导通,VD2、VD3截止
D. VD1截止,VD2、VD3导通

如下图所示电路中,已知I1=10mA,I3=5mA,I4=12mA,则I2、I5、I6分别为()。

A. -7mA,5mA,8mA
B. -7mA,5mA,17mA
C. -7mA,8mA,5mA
D. 17mA,-5mA,7mA

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