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【简答题】
(1)瓦斯的主要成分是( ) 2014年8月19日,安徽淮南某煤矿发生井下特大瓦斯爆炸事故.瓦斯是煤矿矿井下有害气体的总称,它已成为煤矿事故的“头号杀手”. (1)瓦斯的主要成分是甲烷.甲烷在空气中完全燃烧的化学方程式为 . (2)为了防止煤矿的矿井发生瓦斯爆炸事故,下列做法可行的是 (填序号,下同). A.进矿井前先做灯火实验 B.工人必须戴安全帽才能进入矿井 C.矿井内要加强通风 D.安装瓦斯探头传感器监测瓦斯浓度 (3)矿井下特大瓦斯爆炸事故发生后,专家提出了注入液氮灭火的方案.液氮可用于矿井灭火的原因是 、 (写出两条). (4)救援过程中,打通“生命之”及时向被困人员输送含有下列成分的营养液,该营养液中的主要供能物质是 . A.水 B.葡萄糖 C.维生素 D.氯化钠.
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【单选题】The panda is a kind of animal __ can be found in China. (2006年)
A.
who
B.
whose
C.
which
D.
where
【单选题】由离散时间系统【图片】的极点可以定性判断出系统时域特性，若【图片】具有单实数极点【图片】，则以下哪条描述的系统时域特性不正确 ( )
A.
当 ， 为增幅指数序列
B.
当 ， 为增幅振荡序列
C.
当 ， 为衰减指数序列
D.
当 ， 为等幅序列
【简答题】阅读理解 The giant panda is known as the national treasure of China. The panda was a kind of common animal in China long ago. However, for some reasons, too many of them have been killed. So the number of...
【单选题】The panda is a kind of animal________ can be found only in China. [ ]
A.
which
B.
who
C.
where
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whose
【单选题】---The panda is a kind of animal _______ I like best.
A.
who
B.
which
C.
where
D.
what
【单选题】What kind of life does the panda live?
A.
She lives with her parents forever.
B.
She lives with her brothers and sisters.
C.
She lives independently as soon as she is born.
D.
She lives independently more than one year after birth.
【单选题】Despite being as a meat eater ,the panda has a diet that is overwhelmingly vegetarians
A.
voltage step
B.
sort
C.
classified
D.
kind
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