下列有关说法中正确的是( ) A.焓变大于零的反应一定不能自发进行 B.焓变小于

题型:选择题

问题:

下列有关说法中正确的是(  )

A.焓变大于零的反应一定不能自发进行

B.焓变小于零的反应一定能自发进行

C.焓变小于零且熵增加的过程对应的反应能自发进行

D.对于同一物质来讲,熵值的大小与其状态有关,固态物质的熵值最大

考点:焓变、反应热
题型:选择题

阅读理解。

     Jim Green has been in China for more than two years. He has been to many interesting places in

Beijing, but he has not yet been to many other parts of China. Last week he went to Mount Emei in

Sichuan Province with his family.

     Many people like to travel by air, but Jim's family think that travelling by train is the best. It is much

cheaper and far more enjoyable than a rushed trip by air.

     Early one moming, they took a taxi to Beijing West Railway Station. The station was very lively.

There were bookshops,food shops and stores selling all kinds of things. Mrs Green bought some fruit,

food and bottles of water to take on the train. She said that it was better toget some food before they

got on the train because food on the train was usually too expensive.

     The train was quite comfortable,and there weren't too many people in their sleeping car. The Greens

could stand up and walk around. It was a long journey, but none of them felt tired. They kept watching

the beautiful scenery out of the window. They walked, laughed and played cards. The conductor kept

coming to offer them hot water and selling them magazines. People nearby talked with each other. A

young man practiced speaking English with Mr Green. Jim thought the train was like a big moving party.

He went to sleep quite late. He listened to the click of the rails and then fell fast asleep.

     When Jim woke up the next morning, the train was already near Chengdu. His train ride seemed really

short, but his memory of the pleasant trip would last long.

1. How long has Jim been in China?

                                                                               

2. Where did Jim go to travel with his family?

                                                                               

3. Why does Jim's family like to travel by train?

                                                                               

4. What did Mrs Green buy before getting on the train?

                                                                               

5. Did the Greens feel tired on the train? Why or why not?

                                                                               

题型:选择题

一桌普通的饭菜竟被不明不白的强索1500元。经消协调解无效,一纸诉状将店主告上法院,理由是店主侵犯了他们的[    ]

①对商品和服务的知悉权

②公平交易权

③自愿消费权

④财产安全权

A.①②

B.①②③④

C.①②③

D.②③④

题型:选择题

(四)甲公司与机械厂订立的书面合同约定:机械厂向甲公司出售木工刨床2台,编号分别为1号、2号;货物验收完毕后一次性付款。合同对履行地点和方式未作约定。双方签订合同的当日,乙公司的采购员闻讯赶到机械厂,声称乙公司已于1个月之前与机械厂达成口头协议,机械厂已承诺将1号刨床出售给乙公司,现在乙公司正在准备货款。乙公司据此主张甲公司与机械厂之间的合同无效,并要求机械厂将1号刨床交付乙公司。机械厂承认与乙公司之间的口头约定,但拒绝了乙公司的要求,将1号刨床交付甲公司。3日后,机械厂又委托运输公司将2号刨床送往甲公司,该刨床在运输过程中毁损。根据上述事实,回答下列问题:

(2000,77)2号刨床在运输过程中毁损,该风险应由( )承担。

A.机械厂

B.运输公司

C.甲公司

D.机械厂与甲公司共有

题型:选择题

标准节流装置由哪几部分组成?

题型:选择题

可编程序控制器梯形图的基本结构组成为()。

A.左母线

B.右母线

C.编程触点

D.线圈

E.连接线

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