西安事变成为扭转时局的关键,这里的“时局”主要是指() A.扩大侵华 B.美日争夺激

题型:单项选择题

问题:

西安事变成为扭转时局的关键,这里的“时局”主要是指()

A.扩大侵华

B.美日争夺激烈

C.抗日高潮出现

D.国共分裂对峙

考点:中国近现代史纲要中华民族的抗日战争中华民族的抗日战争题库
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___with a difficult situation, John decided to ask his boss for advice.  [ ]

A. To face      

B. Having faced    

C. Faced      

D. Facing

题型:单项选择题

B


Waste can be seen everywhere in the school. Some students ask for more food than they can eat and others often forget to turn off the lights when they leave the classroom. They say they can afford these things. But I don’t agree with them.
Waste can bring a lot of problems. Although China is rich in some resources (资源), we are short of(缺乏) others, for example, fresh water(淡水). It is reported that we will have no coal (煤) or oil to use in 100 years. So if we go on wasting our resources, what can we use in the future and where can we move Think about it. I think we should say no to the students who waste things every day. Everybody should stop wasting as soon as possible.
In our everyday life, we can do many things to prevent waste from happening, for example, turn off the water taps (水龙头) when we finish washing, turn off the lights when we leave the classroom, try not to order more food than we need, and so on. Little by little, everything will he changed. Waste can be stopped one day, if we do our best.

Which is the best title of this passage ( )

A.Stop Wasting

B.School Life

C.Waste in the School

D.Rich Resources in China

题型:单项选择题

实验室常用的抗凝剂有哪些?

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基数效用论和序数效用论的主要区别是( )。

A.效用是否客观
B.效用是否可以加总
C.效用函数是否是线性的
D.边际效用是否是递减的

题型:单项选择题

加工零件时产生表面粗糙度的主要因素是()。

A.刀痕和振动

B.进给不均匀

C.机床的几何精度

D.快速进给

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