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【单选题】
下列有矿山火灾的分类和特点的描述，不正确的是( )A.
根据引火源的不同，矿山火灾可分为外因火灾和内因火灾两大类
B.
外因火灾是指由于外来热源，如明火、爆破、瓦斯煤尘爆炸等原因造成的火灾
C.
内因火灾是指煤(岩)层或含硫矿场在一定的条件和环境下自身发生物理化学变化积聚热量导致着火而形成的火灾
D.
内因火灾的特点是突然发生，来势凶猛，如不能及时发现，往往可能酿成恶性事故
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A.
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B.
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C.
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D.
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A.
It has denied the authenticity of the pictures of abused prisoners.
B.
It has supported the decision to stop the publication of the pictures.
C.
It has considered the pictures of abused prisoners unacceptable.
D.
It has been worrying about the violence incited by the pictures.
【简答题】把q 1 =4×10 -9 C的试探电荷放在电场中的A点,具有6×10 -8 J的电势能,求A点的电势.若把q 2 =2×10 -10 C的试探电荷放在电场中的A点,电荷具有的电势能是多少?
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【简答题】Kerry Blasts Bush Iraq “mistake” 1. Democrat presidential hopeful John Kerry has accused President Bush of failing to do enough to get the world support needed to win peace in Iraq. 2. In a weekly rad...
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【单选题】听力原文： The United States has strongly criticized the broadcast of previously unseen images of alleged prisoner abuse at Abu Ghraib Prison in Iraq. The images, which show prisoners apparently being tort...
A.
It has denied the authenticity of the pictures of abused prisoners.
B.
It has supported the decision to stop the publication of the pictures.
C.
It has considered the pictures of abused prisoners unacceptable.
D.
It has been worrying about the violence incited by the pictures.
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【简答题】把q 1 =4×10 -9 C的试探电荷放在电场中的A点,具有6×10 -8 J的电势能,求A点的电势.若把q 2 =2×10 -10 C的试探电荷放在电场中的A点,电荷具有的电势能是多少?
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