You will hear 8 short conversations. After each conversation, there will be a recorded question. After each question, there will be a pause of 10 seconds. The conversations and questions will be spoken twice. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.[音频]
At 8:00.
B. At 7:00.
C. At 7:30.
D. At 6:30.
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[音频]
A. It’s not as good as it was.
B. It’s better than people say.
C. It’s better than it used to be.
D. It’s not better than people say.
[音频]
A. She agrees with the man.
B. She is wild, too.
C. She doesn’t agree with the man.
D. The man is wild, too.
白炽灯的额定工作电压为220V，它允许承受的最大电压为（ ）
A. 220V
B. 311V
C. 380V
D. 200V
正弦量的三要素是指（ ）。
A. 电阻、电感和电容
B. 有效值、频率和初相
C. 电压、电流和相位差
D. 瞬时值、最大值和有效值
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