题目内容

听力原文：Ladies and gentlemen, I'm sorry to announce that tonight's concert will be delayed by an hour due to technical difficulties. The program will now begin at 7 p.m. We encourage you to visit the cafeteria in the basement, and our display of vintage photographs on the first floor. Please be sure to carry your passes with you when you leave the hall. You will need to show them at the entrance when you come back for the performance.
What is the purpose of the announcement？

A. To introduce a main guest.
B. To inform. listeners of a schedule change.
C. To say that a special display has opened.
D. To thank performers at a show.

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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.

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