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如图所示是重机主钩的控制原理图，现该主钩电机往上升方向运行正常，往下降方向不动作，对照控制原理图分析其故障原因有哪些？

答案

参考答案：

1、SC常闭联锁触点接触不好。

2、XC接触器线圈损坏。

3、控制器控制ZK2、ZK5触点接触不好。

4、从5-28号线支路线路断线。

5、XC2常开接点接触不好造成往下降方向打时制动器打不开。

单项选择题

党的十八大的主题是：高举中国特色社会主义伟大旗帜，以邓 * * 理论、“三个代表”重要思想、（）为指导，解放思想，改革开放，凝聚力量，攻坚克难，坚定不移沿着中国特色社会主义道路前进，为全面建成小康社会而奋斗。

A.十二五规划

B.毛 * * 思想

C.科学发展观
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问答题

At the invitation of President George W. Bush, I will be attending and actively participating in the Group of Eight meeting this week in Sea Island, Georgia. The G-8 nations have rightly identified African development, AIDS, global peace and security, private sector-led growth and the alleviation of poverty through greater trade as the essential issues concerning the world and Africa in particular. I agree with this assessment. But this year I come to the G-8 .meeting to convey a new sense of urgency in our collective work. On Thursday, I plan to support five tangible proposals for the G-8 that I deem globally urgent, highly practical and wholly feasible, with results that will be quickly measurable. We must identify and reduce the unintentional waste of foreign aid that happens through poor procedures, duplication and flawed management. We must initiate a "counter-brain drain." For decades, developing countries have been educating and training highly skilled individuals and managers, who systematically leave their countries — the countries that so desperately need them — and become absorbed in the economies of developed countries. We should begin to issue "business passports" based on the economic activities of individuals, not on citizenship or nationality. We need to endorse and organize a world conference for Islamic-Christian dialogue within the next six months. We can remove corruption, while increasing efficiency at the same time. The allocation of resources to our nations today takes a painfully long time. But the handicap of delays can be avoided. The president of the World Bank, James Wofensohn, once said that an African country that expresses the need to realize a project — a road, for example — has to wait at least five years. Five years is too long. In Africa, we die waiting. I am not attending the G- 8 meeting in search of funding or handouts, but to propose and support what we need most — dynamic ideas that can be implemented without delay. I start with these five.
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