将棱长为10cm的正方体铝块熔化，重新铸成4个大小相等的小正方体

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问题解答题

将棱长为10cm的正方体铝块熔化，重新铸成4个大小相等的小正方体．通过计算，求每个小正方体的棱长（不计损耗，结果保留2个有效数字）提示：V正方体=a3，参考数值：

250

≈15.81，

3	250

≈6.300，

≈6.325，

3	40

≈3.420．

答案

棱长为10cm的正方体铝块的体积是：1000cm³，则每个小正方体的体积是：

1000

=250（cm³），

则每个小正方体的棱长是：

3	250

≈6.300cm．

改错题

I am worker at the tap water company. I find that 1. __________

people were becoming more and more careful about 2. __________

health .If the tap water appear a little bit unclear 3. __________

and muddy, the telephone will ring again and again. 4. __________

Fortunately, people do not pay equal attention to the 5. __________

protection of water resources .For the sake of our 6. __________

health, we should take good care our water resources 7. __________

and environment. There is a saying “whether we do 8. __________

not careful protect our environment, the last drops 9. __________

of water we will see them will be our own tears.” 10. __________

填空题

在新时期，推进现代化建设，更需要大力倡导和发扬艰苦创业精神，尤其是____________精神。