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问题 选择题

与铂同族的贵金属钯（Pd）有多种同位素．下列关于46103Pd、46104Pd的说法正确的是（　　）

A．质子数相同，互称为同位素

B．中子数相同，化学性质不同

C．核外电子数相同，是同一种核素

D．质量数不同，互称为同素异形体

答案

答案：A

填空题

The UK wants Chinese teachers to help to increase the level of maths in its ____小题1:____. Chinese students ___小题2:______the highest international test results. There is a huge ____小题3:____in maths levels between the UK and China. A newspaper said: "The children of cleaners in Shanghai do better than ____小题4:_____of UK doctors and lawyers in global maths tests." The UK will hire 60 ____小题5:______Shanghai's best maths teachers to help improve the ability of one million British students.

The UK is ____小题6:_____behind many countries in maths. Poor education in maths costs the UK economy $30 billion a year. Britain's education minister went on ____小题7:______fact-finding task to China. She said: "We have some excellent maths teachers…but ___小题8:______I saw in Shanghai… strengthened my belief that we can learn from them." She added: "They have a can-do attitude to maths and I want us to ____小题9:____that." Having better Maths skills mean you can get ____小题10:_____salaries and better jobs.
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判断题

国际间接投资和国际直接投资一样，都涉及实物和货币两种形态的资本转移。
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