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【简答题】
已知： ①CaCO 3 （s）═CaO （s）+CO 2 （g）△H=+178.2kJ?mol -1 ②2Na（s）+Cl 2 （g）═2NaCl （s）△H=-822.0kJ?mol -1 ③H-H、Cl-Cl和 H-Cl的键能分别为436kJ?mol -1 、243kJ?mol -1 和431kJ?mol -1 则： （1）上述反应①②中属于放热反应的是______（填序号）． （2）根据=2/*MERGEFORMAT ②计算生成1mol NaCl（s）时，△H=______ kJ?mol -1 ． （3）根据③推算：Cl 2 （g）+H 2 （g）═2HCl （g） 的△H=______kJ?mol -1 ．
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举一反三
【简答题】From the quiz researchers find that most people are quite confident about their feelings in the ______.
【多选题】下列与购入存货相关的费用中,应计入存货采购成本的有( )
A.
入库后的保管费
B.
运输途中的包装费
C.
运输途中的保险费
D.
运输途中的合理损耗
E.
入库前的挑选调整费
【单选题】The purpose of this passage is to tell people that ______.
A.
most old people die from accidents at home
B.
up to half of home accidents could be prevented
C.
falls at home can be avoided by taking some simple measures
D.
protection of old people should be the first concern for the public
【单选题】It can be inferred from the first two paragraphs that______.
A.
most people think that hummingbirds and insects fly in a similar way
B.
most people think that hummingbirds and birds fly in a similar way
C.
few people think that hummingbirds are skilled at hovering
D.
few people think that birds get their lift from up and down beats
【单选题】It can be known from the passage that ______.
A.
most people think white people are Europeans
B.
there are many Africans and Asians living in Europe
C.
white men are Europeans in the eyes of Africans and Asians
D.
the British people think of themselves as Europeans
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