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The fifth grade mathematics examination paper of Peking University Edition
Page 17 Peking University Green Card People's Education Edition fifth-grade multiple-choice questions answer the fourth small question: a computer monitor covers an area of 9(A) and 2(B). A square centimeter b cubic decimeter c square decimeter d cubic centimeter

Forging the iron block of a cuboid into a cube has no change in volume. (t) judging