随着催化裂化的反应时间的不断增加，下列变化正确的是（）。A、_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

随着催化裂化的反应时间的不断增加，下列变化正确的是（）。

A、焦炭产率上升

B、气体产率下降

C、柴油产率上升

D、汽油产率上升

答案

参考答案：A

选择题

如图所示，Y曲线反映的是某商品的价格与需求量之间的关系。下列说法正确的是(　　)

A．该商品的需求量与价格成反比

B．该商品的价格由需求量决定

C．该商品的需求量由价格决定

D．该商品价格越高需求量越大

完形填空

请从方框中选择正确的词的适当的形式填空。（每空1分，共10分）

transport ,home, shock, survivor, destroy, pack up

    On May 12, 2008, an earthquake took place in Sichuan, which
the whole nation. About 5 million houses were         in the earthquake.
A great number of people were        and they had got to sleep outdoors. Food, water and electricity were hard to get. After the earthquake, people at home and abroad raised money to help those               .
At the same time, tents as well as food were        and        to Sichuan.