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【判断题】
听觉信号有号角,口笛,响墩发出的音响和客货车、轨道车的笛声。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】You had one of your teeth pulled out yesterday, ______?
A.
had you
B.
hadn’t you
C.
did you
D.
didn’t you
【单选题】听力原文：W: When are you going to have your eyes checked? M: I had to cancel my appointment, I Couldn't fit it in. Q: What does the man mean? (18)
A.
He decided not to cancel his appointment
B.
His new glasses aren't comfortable.
C.
He's too busy to get a checkup.
D.
He has to check when the appointment is.
【单选题】听力原文：W: When are you going to have your eyes checked? M: I had to cancel my appointment. I couldn't fit it in. Q: What does the man mean? (17)
A.
He decided not to cancel her appointment.
B.
His new glasses aren't comfortable.
C.
He's too busy to get a checkup.
D.
He has to check when the appointment is.
【简答题】超声波雷达的主要性能指标有哪些?
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