a=3是直线ax+2y+3a=0与直线3x+(a-1)y=a-7平行的( ) A

题型:选择题

问题:

a=3是直线ax+2y+3a=0与直线3x+(a-1)y=a-7平行的(  )

A.充分非必要条件

B.必要非充分条件

C.充要条件

D.非充分非必要条件

考点:直线的方程
题型:选择题
阅读下面短文,根据所读内容在表格中的空白处填入恰当的单词。
注意:每个空格只填一个单词。
For years, researchers have looked into a possible relationship between heat and violence. There are conflicting results over whether there is an actual connection between rising anger and rising temperature, but the murder rate constantly increases during the months of July and August, according to the FBI’s annual crime report.
Many police chiefs say they put more policemen on the streets when the heat rises. “Calls for service always increase from May, June, July and August,” said New Bedford’s Captain Richard Spiriet. “The longer period of time you have the heat, the worse it is. It’s just the opposite in the winter time.”
Craig Anderson, a professor and specialist in social psychology at Lowa State University, argues the evidence is clear. “As the temperature goes up, people become more uncomfortable. They become easier to get angry,” he said. “That increases the possibility that a small conflict will be interpreted as more major.” Anderson conducted a couple of studies looking at crime rates over the course of several years within the same area to see when most violent crimes occurred. He found that violent crimes were more likely to occur on hot days and hot months - even hot years had higher violent rates than cold years, according to his research.
Other research shows it is not so much the physical climate, but rather the social climate, that causes increased violence. “During the summer months, people stay up later. They talk with their neighbors. They party with their friends,” said Jack Levin, director of the Brudnick Centre on Violence at Northeastern University. “There are more likely to be large numbers of people interacting, and they are more likely to argue.”
Perhaps the realization that there is a link will help people in an argument step back and say, “Let’s cool off” - both literally (字面上地) and figuratively (比喻地).
Title
Heat and Violence
Theme
Violence possibly has a 小题1:___________ with heat.
Facts
☆July and August witness the小题2:____________ increase of murder rate.
☆More policemen are called in with the heat小题3:___________.
☆People get angry more小题4:___________ as the temperature goes up.
小题5:_________ of the research
☆Fewer violent crimes occur on 小题6:___________ days.
☆The小题7:___________ climate causes increased violence.
☆People usually go to小题8:___________ later during the summer months.
☆There are more likely to be小题9:____________ when people chat with each other.
Conclusion
小题10:__________the link will help people in an argument cool off.
题型:选择题

2010年4月14日7时49分,青海玉树发生7.1级地震,14日当天,中央财政紧急下拨救灾资金2亿元。据此回答5—6题。

小题1:政府的这些救灾拨款属于

A.财政收入

B.财政支出

C.财政节余

D.财政决算小题2:这些救灾资金,按国民收入的最终用途划分,应属于:

A.扩大再生产

B.非生产性基本建设

C.社会物资储备

D.公共消费

题型:选择题

水泥石由()、()、()等组成。

题型:选择题

成套设备在《出入境检验检疫机构实施检验检疫的进出境商品目录》中的“检验检疫类别”为( )。

A.A/
B./B
C.M/
D./N

题型:选择题

干式激光胶片的保存环境温度应保持在()。

A.0~20℃

B.5~25℃

C.10~30℃

D.15~35℃

E.35℃以上

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