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【简答题】
Junk food is everywhere. We’re eating way too much of it. Most of us know what we’re doing and yet we do it anyway. So here’s a suggestion offered by two researchers at the Rand Corporation: Why not take a lesson from alcohol control policies and apply them to where food is sold and how it’s displayed? “ Many policy measures to control obesity (肥胖症) assume that people consciously and rationally choose what and how much they eat and therefore focus on providing information and more access to healthier foods, ” note the two researchers. “ In contrast,” the researchers continue, “many regulations that don’t assume people make rational choices have been successfully applied to control alcohol, a substance — like food — of which immoderate consumption leads to serious health problems.” The research references studies of people’s behavior with food and alcohol and results of alcohol restrictions, and then lists five regulations that the researchers think might be promising if applied to junk foods. Among them: Density restrictions: licenses to sell alcohol aren ’ t handed out unplanned to all comers but are allotted (分配) based on the number of places in an area that already sell alcohol. These make alcohol less easy to get and reduce the number of psychological cues to drink. Similarly, the researchers say, being presented with junk food stimulates our desire to eat it. So why not limit the density of food outlets, particularly ones that sell food rich in empty calories? And why not limit sale of food in places that aren’t primarily food stores? Display and sales restrictions: California has a rule prohibiting alcohol displays near the cash registers in gas stations, and in most places you can’t buy alcohol at drive-through facilities. At supermarkets, food companies pay to have their wares in places where they’re easily seen. One could remove junk food to the back of the store and ban them from the shelves at checkout lines. The other measures include restricting portion sizes, taxing and prohibiting special price deals for junk foods, and placing warning labels on the products.
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【单选题】( ) 关键字标志着 PL/SQL 程序中声明部分的开始,可以声明变量、常量及游标等。
A.
begin
B.
end
C.
declare
D.
exception
【判断题】测定硫酸中的铁利用硫氰酸盐比色法。
A.
正确
B.
错误
【单选题】当延时 ι =0时,自相关系数为()
A.
最大值
B.
最小值
C.
1
D.
0
【多选题】电子垃圾造成的环境污染有:
A.
B.
C.
D.
二恶英
【简答题】1983年世界上第一款手机报废后,美国科学家提出了手机污染这个词。后来人们把手机对周围造成的一些污染通称为手机污染。科技持续进步导致手机更新换代越来越短,由此产生大量的废旧电池。联合国环境规划署2012年发布了《化电子垃圾为资源》报告。报告称,全球每年废弃的手机有4亿部,我国每年会有1亿部手机被淘汰。 说明废弃手机处 置不当可能产生的污染,以及针对这些污染生产厂商可采取的措施。
【单选题】在某城市数字城市化项目中,( )对该测绘项目的产品质量负直接责任。
A.
测绘地理信息主管部门
B.
项目质量负责人
C.
监理单位
D.
验收单位
【单选题】如果PL/SQL程序块的可执行部分引发了一个错误,则程序的执行顺序将发生 什么变化?( )
A.
程序将转到EXCEPTION部分运行
B.
程序将中止运行
C.
程序仍然正常运行
D.
以上都不对
【单选题】“电子垃圾”中含有金属铜和少量贵金属金、银等,直接废弃将严重污染环境且造成金属资源浪费。社会实践小组为回收这些金属,设计了以下操作步骤: ①分拆、灼烧:把废弃电子产品分拆后灼烧,将部分金属转化为氧化物; ②酸洗:用硝酸溶解灼烧得到的混合物,过滤,收集残渣中的金; ③回收:利用合适的金属提炼出滤液中的铜和银。 为达到分别提炼金属铜、银的目的,下列方案合理的是
A.
用金属铁同时提炼出铜和银
B.
先用金属铜提炼出银,再用金属铁提炼出铜
C.
用金属铁提炼出金属铜
D.
用金属铜提炼出金属银
【单选题】如果PL/SQL程序块的可执行部分引发了一个错误,则程序的执行顺序将发生什么变化?
A.
程序将转到EXCEPTION运行
B.
程序将终止运行
C.
程序仍然正常进行
D.
以上都不对
【单选题】PL/SQL程序块的声明部分以( )关键字为标志。
A.
DECLARE
B.
BEGIN
C.
END
D.
EXCEPTION
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