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Why is a high concentration of a potassium salt sometimes added to standards and samples in flame ab
sorption methods？
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更多“Why is a high concentration of…”相关的问题
What do you think the long-term effects of high staff turnover might be？ (Why？ / Why not？)
Why does the author mention the high infant death rates in the last two paragraphs？
A．To illustrate the inefficiency of the Government.
B．As the data of Helen Christensen's research project.
C．To illustrate the difficult pregnancy and motherhood.
D．As the result of mothers' absent-mindedness and tiredness.
Why did Egyptians build Aswan High Dam？
A．In order to sail upstream.
B．In order to control the flood.
C．In order to attract visitors.
Why does the author say high consumption is a mixed blessing？
A．Because poverty still exists in an affluent society.
B．Because moral values are sacrificed in pursuit of material satisfaction.
C．Because over-consumption won't last long due to unrestricted population growth.
D．Because traditional rituals are often neglected in the process of modernization.
Why do most parents feel embarrassed when their children graduate from high school？
A．Because they can"t afford their children"s college tuition.
B．Because they can"t offer their children emotional support.
C．Because they can"t look after their children.
D．Because they can"t give their children birthday gifts.
Why are Europeans particularly concerned with building materials？
A．Lots of building materials there are radioactive.
B．Up to 90% of them stay home.
C．They have a high rate of lung cancer.
D．They spend most of their time indoors.
According to the advertisement, why would teenagers need a limousine？
A．For shopping with friends.
B．For high school graduation prom.
C．For visiting the local airport.
D．For holding birthday parties.
Why does the man think the price is too high？
A．The location is not good.
B．The neighbors are too noisy.
C．Some repairs must be done.
D．Traffic is too heavy.
Why are there still high buildings, or even skyscrapers in many cities？
A．Because they are the symbol of modern time.
B．Because many cities now lack building space.
C．Because high buildings are an important financial source of a city's budget.
D．Because high buildings represent the level of a country's science and technology.
Why did the cliff dwellers of the American Southwest build their homes so high up？
A．To protect themselves from enemies.
B．To have a good view of the valley below.
C．To get more sunshine and fresh air.
D．To escape from the urban noise.
