边际成本可能理解为全部成本或全部可变成本的斜率。

题型:判断题

问题:

边际成本可能理解为全部成本或全部可变成本的斜率。

考点:微观经济学微观经济学综合练习微观经济学综合练习题库
题型:判断题

A small town in Tasmania, an island off the south coast of mainland Australia, is making itself an environmental role model by becoming the country's first plastic bag-free town.

Since April 28, Coles Bay's population of 175 and its tourist shoppers have been using reusable paper or cloth bags to carry their shopping.

Ben Keamey, a local businessman who supports the bag ban, said it would cut  the amount of waste and prevent damage to native wildlife that try to eat the plastic.

"Most businesses here come from the tourism and that's all based on the environment, so people were pretty supportive," he said.

Every year Australians use more than six billion plastic bags. More than half of these come from the supermarket. Since it takes years for the bags to biodegrade(生物递减分解), tens of millions end up polluting the environment. They kill about 100,000 sea-birds and animals, which mistake bags for food, every year.

Only in the past few months have major Australian supermarkets begun cutting on their use of plastic bags. Environmental groups are pushing for a plastic bag fee like that in Ireland. There, since plastic bags cost 10 pence (about 1 yuan) each, their use has been cut by 90 per cent.

Pollution caused by plastic bags is a big headache for countries all over the world. As early as 1999, Beijing said that only plastic bags of certain thickness could be used. This was to encourage them to be used again and again, since an average of six million plastic bags are used there every there every single day.

小题1:Which might be the best title for this passage?

A.Deadly Plastic Bags

B.The End of Plastic Bags

C.How to Reuse Plastic Bags

D.The Present Situation of Plastic Bags小题2:Plastic bags will not be used by the native people of Coles Bay because they ______.

A.cause the environmental pollution

B.are not easy to be reused

C.are not as good as cloth bags

D.are not strong enough小题3:Which of the following statements is NOT true?

A.Plastic bags kill many animals in Australia each year.

B.Most Australian supermarkets have begun cutting on their use of plastic bags.

C.People at Coles Bay think poor environment may affect their tourism.

D.You have to pay for the plastic bags if you go shopping in Ireland.小题4:The example of Coles Bay is to show that ______.

A.people take serious actions to deal with the plastic bag problem

B.people begin to realise the harm of using plastic bags

C.Australia is the first country in solving the plastic bag problem

D.Australians are aware of the importance of protecting the small town小题5:Which of the following measures on plastic bags is NOT mentioned in the passage?

A.To forbid to use them by law.

B.to charge fee for plastic bags.

C.To make them thick enough to be reuseable.

D.To make them environmentally friendly.

题型:判断题

我国发射“嫦娥三号”运载火箭,运载火箭采用液态氢做为火箭的燃料,原因是液态氢具有(   )

A较大的比热容   B较低的沸点

C较大的热值  D较高的凝固点

题型:判断题

住宅共用部位共用设施设备维修基金

题型:判断题

机动车在高速公路行驶,下列做法正确的是?

A.可在路肩停车上下人员

B.可在紧急停车带停车装卸货物

C.可在减速车道或加速车道上超车、停车

D.非紧急情况时不得在应急车道行驶或者停车

题型:判断题

通过收费站,进入行车道时,下面选项中最安全的2种驾驶方法是()?

A.为防备右前方的油罐车变更车道,维持充分的安全距离

B.与其他车辆进行竞争,抢在其他车辆之前加速驶入行车道

C.因为在hipass车道上行驶的车辆是直达行驶(中途不停车),所以没必要维持安全距离

D.一般车辆混入hipass车道的情况,马上在原地停下交纳通行费之后现出发

E.通过收费站之后,因为车道数量减少,所以为防备与旁边的车辆相撞,必须注意行驶

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