能源家族中:①柴薪;②煤炭;③石油;④天然气;⑤水能;⑥风能;⑦太阳能;⑧地热能

题型:问答题

问题:

能源家族中:①柴薪;②煤炭;③石油;④天然气;⑤水能;⑥风能;⑦太阳能;⑧地热能等,在大量耗用各种能源是,会造成空气污染的有 ______;会造成水土流失和沙漠化的是 ______(填题序号);

考点:能源消耗对环境的影响
题型:问答题

已知:a,b,c分别为△ABC的三条边的长度,请用所学知识说明:b2+c2-a2-2bc是正数、负数或零.

题型:问答题
Choose the best topic from A to F according to each paragraph
小题1:Christmas Day, the birthday of Jesus Christ, is the most important festival in Britain and some other countries. On Christmas Eve, people usually tell their children to put their stockings at the end of their beds before they go to sleep.
小题2: Apes(猿) can understand some things more quickly than we can. One or two of them have learned a few words. But they can’t join words to make sentences. They can’t think like us because they have no language.
小题3: The moon is our nearest neighbour in space. It is our satellite and men have visited it already. It is smaller than the earth. Plants can’t grow on the moon because there’s no air or water on it.
小题4:The largest animal ever to live on the earth is the blue shale(鲸). It weighs about 80 tons—more than 24 elephants. It is more than 30 meters long. A newborn baby whale weighs as much as a big elephant.
小题5: We can’t see it and we can’t catch it. But we can feel it pass by. It is always with us in our life. When we are at the table, it passes away while we are eating. Time is life, we must be masters of time.
A. What Is Time                      B. Man And Apes
C. Having A Good Time                D. Our Festival
E. The Moon                         F. The Blue Whale
题型:问答题

MP3随身听以其独特的魅力成为年轻人的时尚,若某品牌MP3正常工作时的功率为0.5W,它连续播放60s消耗的电能为__________J。

题型:问答题

颈动脉鞘由哪组筋膜形成()

A.颈浅筋膜

B.颈深筋膜浅层

C.颈深筋膜深层

D.颈深筋膜中层

E.以上都不是

题型:问答题

简述古立克重新界定政府职能的方案。

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