题干

(1)物理知识在生活和生产中有广泛的应用,如图(a),在雪地上滑行需要穿上滑雪板是为了____ ;如图(b),用管子吸饮料,是利用了____ 将饮料吸入嘴里的.

(2)铝和铜相比较,____ 更合适做家庭电路中的导线材料:为了安全用电,用电器的外壳必须接____ ;超导材料____ 做电热器的发热体(填“能”或“不能”)

(3)如图给出物体AB及像A′B′的位置,请在图中画出凸透镜及其焦点F的大致位置____ .

(4)如图所示是长在枝条上的苹果,请在图中画出苹果受力示意图____ .

(5)在如图中的○里填上适当的电表符号,使之成为正确的并联电路图____ .

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答案(点此获取答案解析)

减小压强,大气压,铜,接地(线),不能,,,

同类题4

阅读理解

    As has been all too apparent in recent days at Balcombe, few issues cause greater concern than energy policy. Many village communities feel their countryside is being ruined by the power-producing machines of wind farms; yet they never take “ direct action”, even though the planning laws put them at a severe disadvantage. And the generous subsidies(财政补贴),which encourage the expansion of wind power, are not favorable to the village communities and set landowners in conflict with other residents.

    Those who disagree with the rapid expansion of wind farms state that the damage they cause is out of proportion to the benefits they bring, because their energy output cannot match that of the carbon-based power stations they are supposed to replace. Supporters insist that wind must be part of a mix of renewables, nuclear and carbon, and that the country is committed to meeting EU(European Union) targets for non-carbon energy generation.

    Against this background, the fact that there is an argument within the Government over whether to publish an official report on wind farms impact on the countryside becomes even more extraordinary. The two parties in the coalition government are in disagreement over what it should say.

    We have some advice for the two parties :publish the report ,and let the country be the judge. Even if it contains evidence that wind farms are harmful, it will hardly be a pleasant surprise to people who do not like them. Equally, supporters must argue their case by acknowledging the concerns and explaining why they are either misplaced or worthy of much attention.

    The suggestion that further negotiations are to take place to produce an “acceptable” report suggests that the politics of coalition government are doing the country harm in a certain way. Given the sensitivities involved ,all the information should be available so that people can reach their own conclusions, rather than being left with the suspicion that facts are being replaced by political beliefs.

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