half a century 等于a half and a century

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• In the second half of the 19th century many great inventions were made.翻译
• compared to the second half of the twentieth century在这里是什么意思,
• 我想找一篇论文的出处What is hydraulic engineering?What is hydraulic engineering?James A.LiggettWhat is hydraulic engineering?James A.LiggettAbstract:This paper,written to mark ASCE's 150th anniversary,traces the role of hydraulic engineering from early or mid-twentieth- century to the beginning of the twenty-first century.A half-century ago hydraulic engineering was central in building the economies of the United States and many other countries by designing sma
• The computer is fast,and never makes a mistake,while people are too slow,and full of mistakes sometimes.That’s what people often say when they talk about computers.For over half of a century,engineers have been making better computers.Now a computer can do a lot of everyday jobs wonderfully.It is widely used in factories,hospitals and banks.A computer can report,decide and control in almost every field.Many computer scientists are now thinking of maki
• 请朋友们帮我修改一篇英语作文请写清错在什么地方,如何修改,怎样表达更好.Women hold up half the skyDo women hold up half the sky?Decades ago ,many people will give you a negative answer ,including me.But today ,I think most of us will say “yes”.There has been such a big change for the last century .When all of the change has not happen,in most people’s mind,including women themselves,believe that it is the duty of women to stay home.Women’s work is to do the housework ,look after babies
• I embrace you for half a century 谁知道这是什么
• 英语翻译A century and a half of scientific inquiry has yet to solve this one.It's clear that a thin layer of liquid water on top of solid ice causes the slipperiness.A fluid's mobility makes it difficult to walk on,even if the layer is thin.But there's no consenus as to why ice -unlike most other solids-has such a layer.Scientists long reasoned that,since water has the unusual property of being less dense as a solid than as a liquid,its melting point can
• half a century 等于a half and a century
• 英语翻译The report by an international group says that more than half of the major rivers are threatened by pollution or too much used by pepole.The warning was given by the World Commission on Water for the Twenty-first Century.The group was established to study the conditions of the world's supply of water.Problems with the world's fresh water supply affect wildlife as well as pepole.In 1998,twenty-five million pepole became refugees from environmental
• half a century after his death, he still continued to be read
• 四边形ABCD正方形,M为BC上任意一点,MN⊥AM且MN交∠ECD的平分线于N.求证AM=MN
• 在0假设中 我要证明样本的均值>0 那么我应该用t检验还是z检验,一尾还是两尾的?