柴油机和汽油机构造相似，主要不同是汽油机汽缸顶部有一个_______爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

柴油机和汽油机构造相似，主要不同是汽油机汽缸顶部有一个______，而柴油机汽缸顶部有一个______；汽油机在吸气冲程吸进汽缸里的是______，而柴油机在吸气冲程吸进汽缸里的是______．

答案

（1）汽油机和柴油机在构造上的区别是：汽油机顶部有个火花塞，柴油机顶部有个喷油嘴；

（2）在吸气冲程里，汽油机吸入气缸的是汽油和空气的混合物，而柴油机吸入的是空气．

故答案为：火花塞；喷油嘴；汽油和空气的混合物；空气．

填空题

在潜水员的面具里安装了盛有过氧化钠(Na₂O₂)的装置。过氧化钠是一种化学性质活泼的浅黄色固体粉末，在通常情况下，它能和CO₂、H₂O反应：

2Na₂O₂+2H₂O==4NaOH+O₂↑、2Na₂O₂+2CO₂==2Na₂CO₃+O₂。某课外兴趣小组为了探究过氧化钠和纯净的二氧化碳反应的产物，设计了如下图所示的实验装置(B、C、D、E中的样品或试剂分别为饱和碳酸氢钠溶液、浓硫酸、过氧化钠、饱和石灰水)。

(1)装置A中放石灰石的玻璃仪器的名称是，装置B的作用可用化学方程式表

示为。

(2)C中浓硫酸的作用是。

(3)检验Na₂O₂和CO₂反应后生成的气体的方法是。

(4)为了证明Na₂O₂和CO₂反应后生成的固体是Na₂CO₃，请你设计一种合理的方案。

完形填空

Pulled from the rubble （碎砖）of the big earthquake after eight days of unimaginable suffering, 8- year-old Kiki Joachin caught the world’s attention. Today he and his 21 struggle to rebuild their home, their lives and their hopes.
When the terrible earthquake broke out, Kiki’s mother 22 from the porch （门廊）of their apartment building 23 her five –year-old-son, David, who was outside fetching water. 24  injured by falling concrete （水泥），she tried to dig through it and 25 toward her five other kids who were 26  in the ruins of their home. 27 , she could make little progress.
For eight days Kiki and his 28 were buried beneath. They curled (蜷缩) their bodies in a (n) 29 space, with no food or water, hardly able to move; nearby lay the 30 of their three other siblings（兄弟姐妹）. Kiki 31  as his sister covered them with her T-shirt.
On the eighth day, a neighbour 32 her possessions heard Kiki’s 33  cries for water. Two 34 spent the next four hours 35 drilling through the rubble and finally 36 Kiki and his sister. As Kiki was 37 by the firefighters from the hole, he made a victory gesture.
Now Kiki hopes to be an engineer when he grows up, so he can help 38  his country. His father wants to start a 39 for his family, maybe selling rice and beans, to be able to put another room on the house so his kids can sleep better. Meanwhile, his father and mother are   40 for what they have and the survival of the three children.

A．in search of

B．in honour of

D．in charge of

A．sorting out

B．showing off

C．looking for

D．giving away

D．firefighters

C．impatiently