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【简答题】
用科学记数法表示下列各数． （1）地球的体积约是1 080 000 000 000立方千米； （2）银河系中的恒星约有一千六百亿个； （3）国家统计局、国务院第五次人口普查办公室公布我国人口达12.9533亿．
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【简答题】气动三大件主要是 (________) 、 (________) 和 (________) 。
【简答题】What did da Vinci's research focus on?
【多选题】What mistakes did Richard make?
A.
He clashed with a group of nobles.
B.
He was unable to accept any challenge to his authority.
C.
He seized the inheritance left to his cousin
【单选题】What did da Vinci appreciate most in Nature?
A.
Its complex design.
B.
Its delicate arrangement.
C.
Its simplicity.
【简答题】What mistakes did Rich make at the dinner table?
【简答题】What mistakes did the writer make at first?
【简答题】What mistakes did the speaker make several years ago and how did he deal with it ?
【简答题】气动三大件主要是 (________) 、 (________) 和 (________) 。
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