血型多聚糖前体的终端为（）。 A.半乳糖 B.L-岩藻糖 C.N-乙酰半乳糖

某公司生产甲、乙和丙三种产品。2009年甲、乙和丙产品计划产量分别为800件、1200件和1500件，单位成本分别为100元、80元和70元，2010年实际产量分别为900件、1000件和1600件，累计实际总成本分别为92000元、86000元和108000元。
要求：

计算2010年乙产品可比产品成本降低额和降低率；

阅读理解

     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.

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                                    

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                                          

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                                          

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                                                            

头脑风暴法是围绕某个中心议题，毫无顾忌、畅所欲言地发表独立见解的一种______思维方法。

A．系统性

B．逻辑性

C．创造性

D．启发性

下列防火防爆措施中，采用隔绝空气、破坏燃烧爆炸助燃条件的是（）。

A.加强通风，降低可燃气体或蒸气、粉尘在空间的浓度

B.密闭有可燃物质的容器、设备

C.防止和控制高温物体作用

D.充装惰性介质，保护有易燃易爆的生产过程

截止阀的拆卸顺序是（）。

A、手轮螺帽--填料压盖--填料--阀芯

B、手轮螺帽--阀芯--填料压盖--填料

C、手轮螺帽--填料--填料压盖--阀芯

D、阀芯--填料压盖--填料--手轮螺帽