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【简答题】
We all need a healthy environment, but we produce waste every day and it does harm to our environment. Though we are young, we can still do something to help. In fact, even the simplest everyday activities can make a real difference to the environment. Here are some ideas for you to live a green life. Remember these three words: reduce, reuse and recycle. Reduce means “use less”. Don’t waste things. This saves money and reduces pollution and waste going into the environment. Before we buy something new, think if it is really necessary or maybe the old one will be just as good! When we do buy things, choose local products if possible, and try not to buy too many things from abroad. Reuse means “use again”. Use things for as long as possible. When we buy things, make sure that they last a long time. We should take care of them so that they will last, and we should repair them if we can instead of throwing them away and buying new ones. Don’t use a paper cup or a paper bag. It’s better to use a china cup and a lunch box because you can use them again. Recycle means “change things into something else”. Although it takes energy to change something into something else, it’s better than throwing things away or burning them. Find out what can be recycled in your neighbourhood and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees. Title: 46 to Live a Green Life We produce waste every day and it is 47 to us. We can do something to help. Ideas Dos Don’ts To 48 Use less * Try to save something. * Don’t buy too many things from foreign 49 . To reuse Use 50 * Use things for as long as possible. * Buy things that last long. * Take care of things or 51 the old things. * Don’t use 52 cups or bags. To recycle Change things into something 53 *Join in recycling programmes. *Buy 54 made from recycled materials. * Don’t 55 things away or burn them.
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【单选题】对于生产函数Q=f(L,K)和成本方程C=wL+rK来说,在最优的生产要素组合点有()。
A.
MRTS LK =w/r
B.
MP K /r=MP L /w
C.
等产量线和等成本线相切
D.
以上都对
【单选题】电控点火系统常见故障的现象和传统点火系统及电子点火系统一样。但由于系统组成、工作原理的差异,发生故障的原因也 。
A.
不尽相同,诊断方法却差异不大
B.
基本相同,诊断方法却差异很大
C.
不尽相同,诊断方法差异很大
D.
基本相同,诊断方法差异不大
【单选题】从动件由最高点回到最低点时,凸轮转过的角度称为( )
A.
回程运动角
B.
推程运动角
C.
远停程角
D.
近停程角
【单选题】对于生产函数Q=f(L,K)和成本方程C=wL+rK来说,在最优的生产要素组合上应该有
A.
等产量线和等成本线相切
B.
MRTSLK=w/r
C.
MPL/w=MPK/r
D.
以上都对
【单选题】在Illustrator中可以创建几种不同类型的图表?
A.
6
B.
7
C.
8
D.
9
【判断题】互联网时代是指再电子计算机和现代通信技术相互结合基础上构建的宽带、高速、综合、广域型数字化电信网络的时代。
A.
正确
B.
错误
【单选题】对于列表L=[1,2,'Python',[1,2,3,4,5]],L[-3]的是( )。
A.
1
B.
2
C.
'Python'
D.
[1,2,3,4,5]
【单选题】从动件由最高点回到最低点时,凸轮转过的角度称为(   )。
A.
回程角
B.
推程角
C.
远休止角
D.
近休止角
【简答题】对于生产函数Q=f(L,K)和成本方程而言,在最优的生产要素组合点上应该有( )。 A.MRTSLK= B.等产量曲线和等对于生产函数Q=f(L,K)和成本方程 而言,在最优的生产要素组合点上应该有(    )。
【单选题】对于生产函数Q=f(L,K)成本方程 C=PLL+PKK 来说,在最优生产组合点上,( )。
A.
等产量线和等成本线相切
B.
MRTSLK=PL/PK
C.
MPL /PL= MPK/PK
D.
MPL /PL= MPK/PK
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