题目:
中学用的课桌的宽度接近[ ]
A.0.5cm
B.0.5dm
C.0.5m
D.0.5km
答案:
答案:C
中学用的课桌的宽度接近[ ]
A.0.5cm
B.0.5dm
C.0.5m
D.0.5km
答案:C
关于非机动车道宽度确定的表述中,正确的有( )。
A.一般推荐1条自行车带的宽度为2.5m
B.非机动车道要考虑最宽的车辆有超车的条件
C.应根据规划确定的自行车设计交通量和每条自行车带设计通行能力来计算自行车车带数
D.如考虑将来可能改为行驶机动车辆,则以6.0~7.0m为妥
E.一般推荐3条自行车带的宽度为3.5m
Seth DeBolt is a plant scientist at the University of Kentucky US. He and other scientists wanted to find a source of fuel that poor people in rural areas of developing countries could use to make electricity.
The United Nations Development Program says a billion and a half people have no electricity. A billion others have an undependable supply.
Professor DeBolt went on a study trip to rural Indonesia. He saw that there was very little waste in the use of agricultural products. Everything that farmers grew was used for something. Even the remains of fruit that people did not eat were fed to chickens.
Little waste meant there was little that could be used for fuel. Growing a separate fuel crop would take land away from food crops. That was something Professor DeBolt did not want to do.
DeBOLT said, "The people at most risk with respect to energy poverty, typically they're the same people who have food insecurity issues as it is. And then any change in availability would be most damaging to that group of people."
But he found one item that was in plentiful supply and would not create competition between food and fuel. Coconut shells are generally thrown out. Yet Professor DeBolt says it has an "excellent" heating value. All someone needs is a way to release that energy.
DeBolt says he and his team see possibilities for coconut power. "Coconuts are growing here and these are the areas where there is possibility for energy poverty to be eased at least in part by these small-scale production systems."
The researchers say these systems could provide as much as thirteen percent of the energy needs of a country like Indonesia. Other tropical countries with large crops of coconuts and similar fruit could benefit, as well.
But DeBolt says this is not a perfect solution. There are technical questions, like how to safely deal with the dangerous waste produced in the process. And there needs to be money to get these projects started.
小题1:Professor DeBolt went on a study trip to rural areas of developing countries to .
A.help farmers make full use of waste
B.seek certain materials to make electricity
C.persuade farmers to grow more coconuts
D.find a suitable place to carry out the experiment小题2:DeBolt thought it was not a good idea to grow fuel crops because .
A.there are plenty of coconuts
B.local farmers have no interest in it
C.it would make food problems worse
D.fuel crop has little use for local farmers小题3:The last two paragraphs mainly tell us that coconut power .
A.needs further experiments and efforts
B.can help solve energy problem perfectly
C.will cause technique and money problems
D.has drawn Indonesia's government attention小题4:What might be the best title for the passage?
A.Make Full Use Of Coconuts
B.Make Power From Coconuts
C.A Perfect Solution
D.Food And Energy Problems
下列有关固定资产的折旧年限的说法,不正确的是( )。
A.房屋、建筑物的最低折旧年限为20年
B.飞机、火车、轮船、机器的最低折旧年限为10年
C.与生产经营活动有关的器具、工具、家具的最低折旧年限为5年
D.电子设备的最低折旧年限为4年
玻璃钢成型方法一般有手糊、()缠绕、()四种。
函数fun的功能是计算Xn double fun(double x,int n) { int i; double y=1; for(i=1;i<=n;i++) y=y*x; return y;} 主函数中已经正确定义m,a,b变量并赋值,并调用fun函数计算:m=a4+b4-(a+b)3。实现这一计算的函数调用语句为【 】。