What is the purpose of the limit switch on gravity davits？A.To cut off the power when the

What is the purpose of the limit switch on gravity davits？

A.To cut off the power when the davits hit the track safety stops

B.To stop the davits from going too fast

C.To cut off the power when the davits are about 12 inches or more from the track safety stops

D.None of the above

提问人：网友sha88mu 发布时间：2022-01-07

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第1题

Do you forget to turn off the lights and heaters when you go out of a room? In 2040 it will not matter. They will turn themselves off—and on again when you return. A sensor will detect the presence of a human and turn the systems on, and when the humans leave, it will turn them off again.

The sensors will work through the central home computer, and they will do much more than just turn the fires and lights on and off for you. They will detect faulty electrical appliances, isolate them so that they cannot harm anyone, and then warn you that they need repair. They will detect fire and if you are out of the house, the computer will call the firemen. It will also call the police should the sensors detect an intruder. You will open the door using your personal card—the one you use for shopping—maybe using a number known only to you.

The author intends to tell the readers that in year 2040 _____.

A. they will live without lights and heaters

B. they will use much more lights and heaters

C. lights and heaters will be on and off automatically

D. there will be no switches of lights and heaters

According to the passage, which of the following statements is true?

A. People often forget to turn off the lights and heaters.

B. People will have a servant to work for them in 2040.

C. People are afraid of year 2040.

D. People will save much trouble with the help of advanced technology.

According to the author, in 2040, new technology _____ .

A. will turn everything into sensors