单项选择题
某电厂100MW机组采用发电机—变压器单元接线接入220kV系统,发电机出口电压为10.5kV,接地故障电容电流为1.5A,由于系统薄弱,若要求发电机内部发生单相接地故障时不立即停机,发电机中性点应采用下列哪种接地方式?( )
A.不接地
B.高电阻接地
C.消弧线圈接地
D.低电阻接地
点击查看答案&解析
<上一题
目录
下一题>
热门
试题
未分类题
Something big is happening to the human race—something that could be called The Great Transformation.The Transformation consists of all the changes that are occurring in human life due to advancing technology. For thousands of years such progress occurred slowly. Now, everything is changing so fast that you may find yourself wondering where all this progress is really leading.Fifty years ago, few people could even imagine things like computers and lasers. Today, a host of newly emerging technologies such as artificial intelligence and genetic engineering are opening up all kinds of new paths for technologists.Like it or not, our advancing technology has made us masters of the earth. We not only dominate all the other animals, but are reshaping the world's plant life and even its soil and rocks, its waters and surrounding air. Mountains are being dug up to provide minerals and stone for buildings. The very ground under our feet is washing away as we chop down the forests, plow up the fields, and excavate foundations for our buildings.Human junk is cluttering up not only the land but even the bottom of the seA.And so many chemicals are being released into the air by human activities that scientists worry that the entire globe may warm, causing the polar icecaps to melt and ocean waters to flood vast areas of the lanD.During the twentieth century, advancing technology has enabled man to reach thousands of feet into the ocean depths and to climb the highest mountains. Mount Everest, the highest mountain of all, resisted all climbers until the 1950's. Now man is reaching beyond Earth to the moon, Mars, and the stars.No one knows what the Great Transformation means or where it will ultimately leaD.But one thing is sure: human life 50 years from now will be very different from what it is today.It's also worth noting that our amazing technology is posing an increasingly insistent question: When we can do so many things, how can we possibly decide what we really should do. When humans were relatively powerless, they didn't have to make the choices they have to make today.Technology gives us the power to build a magnificent new civilization—if we can just agree on what we want it to bE.But today, there is little global agreement on goals and how we should achieve them.So it remains to be seen what will happen as a result of our technology. Pessimists worry that we will use the technology eventually to blow ourselves up. But they have been saying that for decades, and so far we have escapeD.Whether we will continue to do so remains unknown—but we can continue to hopE.The Great Transformation is caused byA.artificial intelligence and genetic engineering.B.the shortage of natural resources.C.the development of practical sciencE.D.unknown reasons.
A.B.
C.
D.
E.
F.
G.
H.
I.
J.
The
K.artificial
L.
B.the
M.
C.the
N.
D.unknown
O.
点击查看答案
未分类题
D注册会计师负责对外商投资企业丁公司增加注册资本进行验证。在执行验资业务时,D注册会计师遇到下列事项,请代为做出正确的专业判断。外方出资者的下列货币出资方式中,符合规定的有( )。
A.外方出资者用其在中国境内购买的外币现金出资
B.外方出资者用其从中国境内举办的其他外商投资企业因清算所得的货币资金出资
C.外方出资者用其从中国境内举办的其他外商投资企业因股权转让所得的货币资金出资
D.外方出资者用其从中国境内举办的其他外商投资企业因减资所得的获悉资金出资
点击查看答案
相关试题
A注册会计师负责审计甲公司20×8年度财...
2AF=AB = BD=DE=AEColumn A Colum...
男性,26岁。反复上腹痛4年,常于秋冬换...
200MW及以上容量的发电机组,其厂用备用...
某变电所中装有几组35kV电容器,每相由4...