Christina is an American girl. She is a good student. Every morning she gets up at 6:00. She has her breakfast at home. Then she wears her uniform and goes to school. She studies hard every day. She eats in the dining room when she is in school. After school, she does her homework first, then she cleans the room and helps her mother with the dinner. Before she goes to bed, she usually reads some books. Then at 10:00 p. m. she goes to bed. She thinks she is happy every day. What do you think of her?

一个几何体的三视图如图所示，则该几何体的体积是（   ）

 中国制造业正在持续发展，汽车制造是重庆制造业的一个代表，请根据所学知识按要求填空．

（1）下列汽车组件中，由有机合成材料制成的是____ （填序号）．

A．钢铁车架  B．真皮座套  C．玻璃车窗  D．橡胶轮胎

（2）钢铁车壳表面喷漆不仅美观，而且可有效防止与空气中的____（填两种物质名称）接触而生锈．

（3）汽车制造需要钢铁，工业上的用赤铁矿（主要成分为氧化铁）与一氧化碳来炼铁的化学方程式为____ ，该反应中____ （填化学式）发生了还原反应．