发布时间:2025-01-31 04:16:08
半径为12.56÷3.14÷2=2m
体积为π×2^2×2=8π 立方米
可以盛稻谷8π×600=4800π≈15079.64千克
雨伞上有个umbrella hanger的东西是干什么这个怎么装上伞
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