题干

为了研究电流产生的热量与哪些因素有关,设计了如图装置,将两根阻值分别为5Ω、10Ω的电阻丝串联后放入两个透明容器中,并封闭等量的空气.通电前,A、B两U形管内的液面相平.该实验中的自变量是(  )

A:电阻大小

B:液柱高度

C:电流大小

D:空气质量

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答案(点此获取答案解析)

B,C,D

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      Eight days for just ¥12,000      

      Departure time:May,October 2012

      Includes:

     ●  Return flights from 6 China’s airports to Naples

     ●  Return airport to hotel transport

     ●  Seven nights’ accommodation at the 3­star Hotel Nice

     ●  Breakfast

     ● The service of guides

     ● Government taxes

     Join us for a wonderful holiday in one of the Europe’s most wonderful corners—Naples in Italy if you want to have a nice time in a beautiful small quiet place.The ancient Romans called the city “happy land” with attractive coastline,colorful towns,splendid views and the warm Mediterranean Sea.Your best choice for a truly memorable holiday!

     Choose between the peaceful traditional villages of Sant’ Agata,setting on a hillside six miles away from Sorrento,or the more lively and well­known international resort town of Sorrento,with wonderful views over the Bay of Naples.

    Breathtaking  scenery,famous  sights  and  European restaurants everywhere.From the mysterious Isle of Capri to the hunting ruins of     Pompeii,and from the unforgettable “Amalfi Drive” to the delightful resorts (度假胜地) of Positano,Sorrento and Ravello,the area is a feast for the eyes!Join us,and you won’t be disappointed!

    Price based on two tourists sharing a double room at the Hotel Nice.A single room,another ¥2,000.A group of ten college students,¥10,000 for each.

    Like to know more?Telephone Newmarket Air Holidays Ltd.on:0845 ­226 ­7788(All calls charge at local rates).