单选题In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by（）.A unscrewing the bulb during the daylightB switching the light on only when necessaryC taking no action as there is no way on sa

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单选题

In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by（）.

unscrewing the bulb during the daylight

switching the light on only when necessary

taking no action as there is no way on saving power

taking no action as they shut off automatically in daylight

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第1题

Please see ( ) the L／C stipulations are in exact accordance with the terms of the Contract.( )A.to itB.to thatC.to it thatD.to it which

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第2题

Can we use this material for the decoration of the exhibition hall?A.Yes. Any available material will do for this jobB.Yes. Water-proof material for the decoration of the hall will be used for the interior decorationC.No. Fire-proof materials should be used for the interior decorationD.No. Only highly-cost materials should be used for the interior decoration

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第3题

DBatteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.71. Which of the following is true of Jae Kwon?A. He teaches chemistry at MU.B. He developed a chemical battery.C. He is working on a nuclear energy source.D. He made a breakthrough in computer engineering.

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第4题

Jae Kwon gave examples in Paragraph 4_________.A. to show chemical batteries are widely applied.B. to introduce nuclear batteries can be safely used.C. to describe a nuclear-powered system.D. to introduce various energy sources.

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第5题

Liquid semiconductor is used to _________.A. get rid of the radioactive wasteB. test the power of nuclear batteries.C. decrease the size of nuclear batteriesD. reduce the damage to lattice structure.

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第6题

Tiny atomic electric batteries have certain advantages over the() storage batteries.A、universalB、indlusiveC、indefiniteD、conventional

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第7题

Small computers need only small amounts of power, _____ many that they will run on small batteries.A. whichB. thatC. thisD. what

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In accordance with SOLAS，the batteries that power interior l

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