Is this the radio you wish_________？A．to have it repairedB．to repair itC．to have repairedD

Is this the radio you wish_________？

A．to have it repaired

B．to repair it

C．to have repaired

D．will be repaired

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发布时间：2020-10-17

更多“Is this the radio you wish_________？A．to have it repairedB．to repair itC．to have repairedD”相关的问题

第1题

Singing Alarms Could Save the Blind If you cannot see, you may not be able to find yo

Singing Alarms Could Save the Blind

If you cannot see, you may not be able to find your way out of a burning building -and that could be fatal. A company in Leeds could______________(51) all that with directional (定向的) sound alarms capable of guiding you to the exit.

Sound Alert, a company run______________(52) the University of Leeds, is installing the alarms in a residential home for______________(53) people in Sommerset and a resource centre for the blind in Cumbria. The alarms produce a ______________ (54) range of frequencies that enable the brain to______________(55) where the sound is coming from.

Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be______________(56) by humans. "It is a burst of white noise that people say sounds like static (静电噪音) on the radio," she says. "Its life-saving potential is ______________(57)."

She conducted an experiment in which people were filmed by thermal-imaging (热效应成像) cameras trying to find their______________(58) out of a large smoke-filled room. It______________(59) them nearly four minutes to find the door without a sound alarm,______________(60) only 15 seconds with one.

Withington studies how the brain______________(61) sounds at the university. She says that the______________(62) of a wide band of frequencies can be pinpointed (精确地确定) more easily than the source of a narrow band. Alarms______________(63) on the same concept have already been installed on emergency vehicles.

The alarms will also include rising or falling frequencies to ______________(64) whether people should go up or down stairs. They were______________(65) with the aid of a large grant from British Nuclear Fuels.

第 51 题

A．change

B．cure

C．demand

D．set

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第2题

YO／YO接线的电压互感器，一次A相熔断器熔断，其二次侧Vbo、Vco（)的电压正常，（)和Vac电压很低，但

YO/YO接线的电压互感器，一次A相熔断器熔断，其二次侧Vbo、Vco()的电压正常，()和Vac电压很低，但不等于零。

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第3题

接入中性点绝缘系统的3台电压互感器，35kV及以上的宜采用（）方式接线。