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A: a decrease in consumer i
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201603-12-Q3The 12th term of an arithmetic progression is 17 and the sum of the first 31 terms is 1023. Find the 31st te
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201711-12-Q6A hot-air balloon is moving vertically upwards with a constant speed of $3.00\ \mathrm{m s^{-1}}$. A sandb
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一周内,英格兰40万学生因疫情被迫回家!
上周,因为疫情相关原因,英格兰地区40多万名学生被迫离开学校,涉及到英格兰一半的中小学。
新闻来源: The Guardian