题目内容

当线圈通有稳恒电流时,线圈中产生自感电动势。

A. 对
B. 错

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当回路中电流发生变化时,回路中产生自感电动势。

A. 对
B. 错

回路中的电流可以发生突变。

A. 对
B. 错

[音频]【单选题】 Questions 5 to 7 are based on the news report you have just heard.Question 5: What did drivers on the motorway to Warsaw find?

A. The road was flooded.
B. The road was blocked.
C. The road was frozen with snow.
D. The road was covered with spilled gas.

【单选题】Question 6:What does the report say about the accident?

A truck plunged into a pool of liquid chocolate.
B. The heavy snow made driving very difficult.
C. The truck driver dozed off while driving.
D. A truck hit a barrier and overturned.

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